1 [main] cmp (7068) C:\cygwin64\bin\cmp.exe: *** fatal error - cygheap base mismatch detected

Enabled outdevs:

License: LGPL version 2.1 or later
Creating config.mak, config.h, and doc/config.texi...
      1 [main] cmp (7068) C:\cygwin64\bin\cmp.exe: *** fatal error - cygheap base mismatch detected - 0x1802FE408/0x180304408.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
      1 [main] cmp (3848) C:\cygwin64\bin\cmp.exe: *** fatal error - cygheap base mismatch detected - 0x1802FE408/0x180304408.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
      1 [main] cmp (10972) C:\cygwin64\bin\cmp.exe: *** fatal error - cygheap base mismatch detected - 0x1802FE408/0x180304408.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
      1 [main] cmp (4068) C:\cygwin64\bin\cmp.exe: *** fatal error - cygheap base mismatch detected - 0x1802FE408/0x180304408.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
      1 [main] cmp (1308) C:\cygwin64\bin\cmp.exe: *** fatal error - cygheap base mismatch detected - 0x1802FE408/0x180304408.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
+ make install
FFmpegInterop\FFmpegConfig.sh: line 117: make: command not found
+ popd
~
+ exit 0
++ '[' 1 = 1 ']'
++ '[' -x /usr/bin/clear ']'
++ /usr/bin/clear

The version of my cygwin1.dll is 2.6.1.

Start by reproducing the Windows/Cygwin build and inspect FFmpegInterop/FFmpegConfig.sh at line 117, where make install is reported after repeated cmp.exe failures. Check the script's prerequisites and Cygwin DLL context; done means the configuration and install steps complete without the reported fatal error or missing make command.