undefined reference to `__imp_xsltGenericDebug'

### This issue affects

Installing github-pages gem.

### What did you do (e.g., steps to reproduce)
I am trying to install github-pages on Cygwin64.
I was able to install Jekyll with
gem install jekyll bundler
That worked fine.
I am unable to install github-pages. I have tried:
gem install --clear-sources github-pages

### What did you expect to happen?
I was expecting a successful installation

### What happened instead?

# I received the following error message. It appears that it is related to building the libxslt.

mschuh@ARSLW18061203 ~/src/jekyll_myblog
$ gem install --clear-sources github-pages
Building native extensions. This could take a while...
ERROR: Error installing github-pages:
ERROR: Failed to build gem native extension.

current directory: /home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri
/usr/bin/ruby.exe -I /usr/share/rubygems -r ./siteconf20200502-63000-1ionkq4.rb extconf.rb
checking if the C compiler accepts ... yes
Building nokogiri using packaged libraries.
Using mini_portile version 2.4.0
checking for gzdopen() in -lz... yes
checking for iconv... yes
************************************************************************
IMPORTANT NOTICE:

Building Nokogiri with a packaged version of libxml2-2.9.10
with the following patches applied:
- 0001-Revert-Do-not-URI-escape-in-server-side-includes.patch
- 0002-Remove-script-macro-support.patch
- 0003-Update-entities-to-remove-handling-of-ssi.patch
- 0004-libxml2.la-is-in-top_builddir.patch
- 0005-Fix-infinite-loop-in-xmlStringLenDecodeEntities.patch

Team Nokogiri will keep on doing their best to provide security
updates in a timely manner, but if this is a concern for you and want
to use the system library instead; abort this installation process and
reinstall nokogiri as follows:

gem install nokogiri -- --use-system-libraries
[--with-xml2-config=/path/to/xml2-config]
[--with-xslt-config=/path/to/xslt-config]

If you are using Bundler, tell it to use the option:

bundle config build.nokogiri --use-system-libraries
bundle install

Note, however, that nokogiri is not fully compatible with arbitrary
versions of libxml2 provided by OS/package vendors.
************************************************************************
Extracting libxml2-2.9.10.tar.gz into tmp/x86_64-pc-cygwin/ports/libxml2/2.9.10... OK
Running git apply with /home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/patches/libxml2/0001-Revert-Do-not-URI-escape-in-server-side-includes.patch... OK
Running git apply with /home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/patches/libxml2/0002-Remove-script-macro-support.patch... OK
Running git apply with /home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/patches/libxml2/0003-Update-entities-to-remove-handling-of-ssi.patch... OK
Running git apply with /home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/patches/libxml2/0004-libxml2.la-is-in-top_builddir.patch... OK
Running git apply with /home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/patches/libxml2/0005-Fix-infinite-loop-in-xmlStringLenDecodeEntities.patch... OK
Running 'configure' for libxml2 2.9.10... OK
Running 'compile' for libxml2 2.9.10... OK
Running 'install' for libxml2 2.9.10... OK
Activating libxml2 2.9.10 (from /home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ports/x86_64-pc-cygwin/libxml2/2.9.10)...
************************************************************************
IMPORTANT NOTICE:

Building Nokogiri with a packaged version of libxslt-1.1.34.

Team Nokogiri will keep on doing their best to provide security
updates in a timely manner, but if this is a concern for you and want
to use the system library instead; abort this installation process and
reinstall nokogiri as follows:

gem install nokogiri -- --use-system-libraries
[--with-xml2-config=/path/to/xml2-config]
[--with-xslt-config=/path/to/xslt-config]

If you are using Bundler, tell it to use the option:

bundle config build.nokogiri --use-system-libraries
bundle install
************************************************************************
Extracting libxslt-1.1.34.tar.gz into tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34... OK
Running 'configure' for libxslt 1.1.34... OK
Running 'compile' for libxslt 1.1.34... ERROR, review '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/compile.log' to see what happened. Last lines are:
========================================================================
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0x738f): undefined reference to `__imp_xsltGenericDebug'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0x7399): undefined reference to `__imp_xsltGenericDebugContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0x74d5): undefined reference to `__imp_xsltGenericDebug'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0x74df): undefined reference to `__imp_xsltGenericDebugContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(saxon.o):saxon.c:(.text+0x613): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(saxon.o):saxon.c:(.text+0x61d): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x4f): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x59): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x110): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x11a): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x22e): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x238): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x41a): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x424): undefined reference to `__imp_xsltGenericErrorContext'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:484: xsltproc.exe] Error 1
make[2]: Leaving directory '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/libxslt-1.1.34/xsltproc'
make[1]: *** [Makefile:615: all-recursive] Error 1
make[1]: Leaving directory '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/libxslt-1.1.34'
make: *** [Makefile:441: all] Error 2
========================================================================
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/bin/$(RUBY_BASE_NAME)
--help
--clean
--use-system-libraries
--enable-static
--disable-static
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--enable-cross-build
--disable-cross-build
/home/mschuh/.gem/ruby/2.6.0/gems/mini_portile2-2.4.0/lib/mini_portile2/mini_portile.rb:402:in `block in execute': Failed to complete compile task (RuntimeError)
from /home/mschuh/.gem/ruby/2.6.0/gems/mini_portile2-2.4.0/lib/mini_portile2/mini_portile.rb:373:in `chdir'
from /home/mschuh/.gem/ruby/2.6.0/gems/mini_portile2-2.4.0/lib/mini_portile2/mini_portile.rb:373:in `execute'
from /home/mschuh/.gem/ruby/2.6.0/gems/mini_portile2-2.4.0/lib/mini_portile2/mini_portile.rb:115:in `compile'
from /home/mschuh/.gem/ruby/2.6.0/gems/mini_portile2-2.4.0/lib/mini_portile2/mini_portile.rb:154:in `cook'
from extconf.rb:365:in `block (2 levels) in process_recipe'
from extconf.rb:257:in `block in chdir_for_build'
from extconf.rb:256:in `chdir'
from extconf.rb:256:in `chdir_for_build'
from extconf.rb:364:in `block in process_recipe'
from extconf.rb:262:in `tap'
from extconf.rb:262:in `process_recipe'
from extconf.rb:574:in `'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

/home/mschuh/.gem/ruby/2.6.0/extensions/x86_64-cygwin/2.6.0/nokogiri-1.10.9/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9 for inspection.
Results logged to /home/mschuh/.gem/ruby/2.6.0/extensions/x86_64-cygwin/2.6.0/nokogiri-1.10.9/gem_make.out

# Here are the contents of the compile.log file:

cat /home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/compile.log
make all-recursive
make[1]: Entering directory '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/libxslt-1.1.34'
Making all in libxslt
make[2]: Entering directory '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/libxslt-1.1.34/libxslt'
CC attrvt.lo
CC xslt.lo
CC xsltlocale.lo
CC xsltutils.lo
CC pattern.lo
CC templates.lo
CC variables.lo
CC keys.lo
CC numbers.lo
CC extensions.lo
CC extra.lo
CC functions.lo
CC namespaces.lo
CC imports.lo
CC attributes.lo
CC documents.lo
CC preproc.lo
CC transform.lo
CC security.lo
CCLD libxslt.la
make[2]: Leaving directory '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/libxslt-1.1.34/libxslt'
Making all in libexslt
make[2]: Entering directory '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/libxslt-1.1.34/libexslt'
CC exslt.lo
CC common.lo
CC crypto.lo
CC math.lo
CC sets.lo
CC functions.lo
CC strings.lo
CC date.lo
CC saxon.lo
CC dynamic.lo
CCLD libexslt.la
make[2]: Leaving directory '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/libxslt-1.1.34/libexslt'
Making all in xsltproc
make[2]: Entering directory '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/libxslt-1.1.34/xsltproc'
CC xsltproc.o
CCLD xsltproc.exe
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0x9e2): undefined reference to `__imp_xsltMaxDepth'
xsltproc.o:xsltproc.c:(.text+0x9e2): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `__imp_xsltMaxDepth'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0x9f5): undefined reference to `__imp_xsltMaxVars'
xsltproc.o:xsltproc.c:(.text+0x9f5): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `__imp_xsltMaxVars'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0xbc7): undefined reference to `__imp_xsltMaxDepth'
xsltproc.o:xsltproc.c:(.text+0xbc7): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `__imp_xsltMaxDepth'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0xbde): undefined reference to `__imp_xsltMaxVars'
xsltproc.o:xsltproc.c:(.text+0xbde): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `__imp_xsltMaxVars'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0x1070): undefined reference to `__imp_exsltLibraryVersion'
xsltproc.o:xsltproc.c:(.text+0x1070): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `__imp_exsltLibraryVersion'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0x107a): undefined reference to `__imp_xsltEngineVersion'
xsltproc.o:xsltproc.c:(.text+0x107a): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `__imp_xsltEngineVersion'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0x10be): undefined reference to `__imp_xsltLibxmlVersion'
xsltproc.o:xsltproc.c:(.text+0x10be): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `__imp_xsltLibxmlVersion'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0x10c7): undefined reference to `__imp_xsltLibxsltVersion'
xsltproc.o:xsltproc.c:(.text+0x10c7): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `__imp_xsltLibxsltVersion'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0x10e1): undefined reference to `__imp_exsltLibxmlVersion'
xsltproc.o:xsltproc.c:(.text+0x10e1): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `__imp_exsltLibxmlVersion'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0x10ea): undefined reference to `__imp_exsltLibexsltVersion'
xsltproc.o:xsltproc.c:(.text+0x10ea): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `__imp_exsltLibexsltVersion'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0x1db3): undefined reference to `__imp_xsltMaxDepth'
xsltproc.o:xsltproc.c:(.text+0x1db3): additional relocation overflows omitted from the output
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: xsltproc.o:xsltproc.c:(.text+0x1e5d): undefined reference to `__imp_xsltMaxVars'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(common.o):common.c:(.text+0x2a5): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(common.o):common.c:(.text+0x2af): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(math.o):math.c:(.text+0x109): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(math.o):math.c:(.text+0x113): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x47): undefined reference to `__imp_xsltGenericDebug'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x51): undefined reference to `__imp_xsltGenericDebugContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x194): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x19e): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1c5): undefined reference to `__imp_xsltGenericDebug'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1cf): undefined reference to `__imp_xsltGenericDebugContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x250): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x25a): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x441): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x44b): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x5b1): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x5d9): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x611): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x639): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x69e): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x6a8): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xa73): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xa9b): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xb95): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xb9f): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xbff): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xc0d): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xd61): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xd6b): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xe31): undefined reference to `__imp_xsltGenericDebug'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xe43): undefined reference to `__imp_xsltGenericDebugContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xf36): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0xf40): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1006): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1010): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x10b2): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x10bc): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1175): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x117f): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1202): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x120c): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1388): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1392): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x13bb): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x13c5): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x141d): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1427): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1528): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1532): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x158e): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1598): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x1653): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(functions.o):functions.c:(.text+0x165d): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(strings.o):strings.c:(.text+0x874): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(strings.o):strings.c:(.text+0x87e): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(strings.o):strings.c:(.text+0xa32): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(strings.o):strings.c:(.text+0xa3c): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(strings.o):strings.c:(.text+0xbe4): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(strings.o):strings.c:(.text+0xbee): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(strings.o):strings.c:(.text+0xeb2): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(strings.o):strings.c:(.text+0xebc): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0xa15): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0xa1f): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0xae2): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0xaec): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0x738f): undefined reference to `__imp_xsltGenericDebug'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0x7399): undefined reference to `__imp_xsltGenericDebugContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0x74d5): undefined reference to `__imp_xsltGenericDebug'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(date.o):date.c:(.text+0x74df): undefined reference to `__imp_xsltGenericDebugContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(saxon.o):saxon.c:(.text+0x613): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(saxon.o):saxon.c:(.text+0x61d): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x4f): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x59): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x110): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x11a): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x22e): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x238): undefined reference to `__imp_xsltGenericErrorContext'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x41a): undefined reference to `__imp_xsltGenericError'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: ../libexslt/.libs/libexslt.a(dynamic.o):dynamic.c:(.text+0x424): undefined reference to `__imp_xsltGenericErrorContext'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:484: xsltproc.exe] Error 1
make[2]: Leaving directory '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/libxslt-1.1.34/xsltproc'
make[1]: *** [Makefile:615: all-recursive] Error 1
make[1]: Leaving directory '/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/tmp/x86_64-pc-cygwin/ports/libxslt/1.1.34/libxslt-1.1.34'
make: *** [Makefile:441: all] Error 2

[compile.log](https://github.com/github/pages-gem/files/4569652/compile.log)
[compile.log](https://github.com/github/pages-gem/files/4569654/compile.log)

# Here are the contents of the mkmkf.log file:

$ cat /home/mschuh/.gem/ruby/2.6.0/extensions/x86_64-cygwin/2.6.0/nokogiri-1.10.9/mkmf.log
"gcc -o conftest.exe -I/usr/include/ruby-2.6 -I/usr/include/ruby-2.6/ruby/backward -I/usr/include/ruby-2.6 -I. -D_XOPEN_SOURCE -D_GNU_SOURCE -ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4 conftest.c -L. -L/usr/lib -L. -fstack-protector-strong -lruby260 "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5: return 0;
6: }
/* end */

"gcc -I/usr/include/ruby-2.6 -I/usr/include/ruby-2.6/ruby/backward -I/usr/include/ruby-2.6 -I. -D_XOPEN_SOURCE -D_GNU_SOURCE -ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4 -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main() {return 0;}
/* end */

have_library: checking for gzdopen() in -lz... -------------------- yes

"gcc -o conftest.exe -I/usr/include/ruby-2.6 -I/usr/include/ruby-2.6/ruby/backward -I/usr/include/ruby-2.6 -I. -D_XOPEN_SOURCE -D_GNU_SOURCE -ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4 -g -DXP_UNIX -Wall -Wcast-qual -Wwrite-strings -Wmissing-noreturn -Winline conftest.c -L. -L/usr/lib -L. -fstack-protector-strong -lruby260 -lz "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include
4:
5: /*top*/
6: extern int t(void);
7: int main(int argc, char **argv)
8: {
9: if (argc > 1000000) {
10: int (* volatile tp)(void)=(int (*)(void))&t;
11: printf("%d", (*tp)());
12: }
13:
14: return 0;
15: }
16: int t(void) { void ((*volatile p)()); p = (void ((*)()))gzdopen; return !p; }
/* end */

--------------------

have_iconv?: checking for iconv... -------------------- yes

"gcc -o conftest.exe -I/usr/include/ruby-2.6 -I/usr/include/ruby-2.6/ruby/backward -I/usr/include/ruby-2.6 -I. -D_XOPEN_SOURCE -D_GNU_SOURCE -ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4 -g -DXP_UNIX -Wall -Wcast-qual -Wwrite-strings -Wmissing-noreturn -Winline conftest.c -L. -L/usr/lib -L. -fstack-protector-strong -lruby260 "
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: /tmp/ccZs1nMZ.o: in function `main':
/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/conftest.c:8: undefined reference to `libiconv_open'
/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/conftest.c:8:(.text.startup+0x14): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `libiconv_open'
/usr/lib/gcc/x86_64-pc-cygwin/9.3.0/../../../../x86_64-pc-cygwin/bin/ld: /home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/conftest.c:9: undefined reference to `libiconv'
/home/mschuh/.gem/ruby/2.6.0/gems/nokogiri-1.10.9/ext/nokogiri/conftest.c:9:(.text.startup+0x2d): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `libiconv'
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include
4: #include
5:
6: int main(void)
7: {
8: iconv_t cd = iconv_open("", "");
9: iconv(cd, NULL, NULL, NULL, NULL);
10: return EXIT_SUCCESS;
11: }
/* end */

"gcc -o conftest.exe -I/usr/include/ruby-2.6 -I/usr/include/ruby-2.6/ruby/backward -I/usr/include/ruby-2.6 -I. -D_XOPEN_SOURCE -D_GNU_SOURCE -ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4 -g -DXP_UNIX -Wall -Wcast-qual -Wwrite-strings -Wmissing-noreturn -Winline conftest.c -L. -L/usr/lib -L. -fstack-protector-strong -lruby260 -liconv "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include
4: #include
5:
6: int main(void)
7: {
8: iconv_t cd = iconv_open("", "");
9: iconv(cd, NULL, NULL, NULL, NULL);
10: return EXIT_SUCCESS;
11: }
/* end */

--------------------

### Additional information

None.

Please help me successfully install github-pages.

Thanks,
Michael

Inizia riproducendo l'installazione di Cygwin64 descritta nell'issue e ispeziona extconf.rb, mkmf.log e il compile.log di libxslt 1.1.34 di nokogiri. Determina se il fallimento può essere risolto in pages-gem o se riguarda il packaging di Nokogiri/libxslt; il lavoro è completo quando viene identificata una correzione specifica del progetto o viene documentato che la dipendenza deve essere gestita altrove.

Scritto dal modello di indicizzazione a partire dal testo della issue.