Build failure on macOS: `open_memstream.c: error: #if with no expression`

Executing:  cd "/opt/local/var/macports/build/vde2-devel-2acd721a/work/build" && /opt/local/bin/cmake -G "CodeBlocks - Unix Makefiles" -DCMAKE_BUILD_TYPE=MacPorts -DCMAKE_INSTALL_PREFIX="/opt/local" -DCMAKE_INSTALL_NAME_DIR="/opt/local/lib" -DCMAKE_SYSTEM_PREFIX_PATH="/opt/local;/usr" -DCMAKE_C_COMPILER="$CC" -DCMAKE_CXX_COMPILER="$CXX" -DCMAKE_OBJC_COMPILER="$CC" -DCMAKE_OBJCXX_COMPILER="$CXX" -DCMAKE_POLICY_DEFAULT_CMP0025=NEW -DCMAKE_POLICY_DEFAULT_CMP0060=NEW -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_COLOR_MAKEFILE=ON -DCMAKE_FIND_FRAMEWORK=LAST -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_MAKE_PROGRAM=/usr/bin/make -DCMAKE_INSTALL_RPATH_USE_LINK_PATH=ON -DCMAKE_MODULE_PATH="/opt/local/share/cmake/Modules" -DCMAKE_PREFIX_PATH="" -DCMAKE_BUILD_WITH_INSTALL_RPATH:BOOL=ON -Wno-dev -DENABLE_CRYPTCAB=OFF -DENABLE_EXPERIMENTAL=OFF -DENABLE_PCAP=ON -DENABLE_TUNTAP=OFF -DCMAKE_OSX_ARCHITECTURES="ppc" -DCMAKE_OSX_DEPLOYMENT_TARGET="10.6" -DCMAKE_OSX_SYSROOT="/" /opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0 
-- The C compiler identification is GNU 14.3.0
-- Checking whether C compiler has -isysroot
-- Checking whether C compiler has -isysroot - yes
-- Checking whether C compiler supports OSX deployment target flag
-- Checking whether C compiler supports OSX deployment target flag - yes
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-- Check for working C compiler: /opt/local/bin/gcc-mp-14 - skipped
-- Detecting C compile features
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-- Configure results:
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--  use VDEPLUG4............ OFF
--  VDE VXLAN............... ON
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--  TAP support............. OFF
--  pcap support............ ON
--  Experimental features... OFF
--  Profiling options....... OFF
-- 
-- 
-- Configuring done (32.3s)
-- Generating done (0.4s)
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_CXX_COMPILER
    CMAKE_OBJCXX_COMPILER
    CMAKE_OBJC_COMPILER
    CMAKE_POLICY_DEFAULT_CMP0025
    CMAKE_POLICY_DEFAULT_CMP0060


-- Build files have been written to: /opt/local/var/macports/build/vde2-devel-2acd721a/work/build
--->  Building vde2-devel
Executing:  cd "/opt/local/var/macports/build/vde2-devel-2acd721a/work/build" && /usr/bin/make -w all VERBOSE=ON 
make: Entering directory `/opt/local/var/macports/build/vde2-devel-2acd721a/work/build'
/opt/local/bin/cmake -S/opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0 -B/opt/local/var/macports/build/vde2-devel-2acd721a/work/build --check-build-system CMakeFiles/Makefile.cmake 0
/opt/local/bin/cmake -E cmake_progress_start /opt/local/var/macports/build/vde2-devel-2acd721a/work/build/CMakeFiles /opt/local/var/macports/build/vde2-devel-2acd721a/work/build//CMakeFiles/progress.marks
/usr/bin/make  -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/opt/local/var/macports/build/vde2-devel-2acd721a/work/build'
/usr/bin/make  -f src/common/CMakeFiles/vdecommon.dir/build.make src/common/CMakeFiles/vdecommon.dir/depend
make[2]: Entering directory `/opt/local/var/macports/build/vde2-devel-2acd721a/work/build'
cd /opt/local/var/macports/build/vde2-devel-2acd721a/work/build && /opt/local/bin/cmake -E cmake_depends "Unix Makefiles" /opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0 /opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0/src/common /opt/local/var/macports/build/vde2-devel-2acd721a/work/build /opt/local/var/macports/build/vde2-devel-2acd721a/work/build/src/common /opt/local/var/macports/build/vde2-devel-2acd721a/work/build/src/common/CMakeFiles/vdecommon.dir/DependInfo.cmake "--color="
make[2]: Leaving directory `/opt/local/var/macports/build/vde2-devel-2acd721a/work/build'
/usr/bin/make  -f src/common/CMakeFiles/vdecommon.dir/build.make src/common/CMakeFiles/vdecommon.dir/build
make[2]: Entering directory `/opt/local/var/macports/build/vde2-devel-2acd721a/work/build'
[  1%] Building C object src/common/CMakeFiles/vdecommon.dir/cmdparse.c.o
cd /opt/local/var/macports/build/vde2-devel-2acd721a/work/build/src/common && /opt/local/bin/gcc-mp-14 -DLOCALSTATEDIR=\"/var\" -DSYSCONFDIR=\"/etc\" -DUSE_WOLFSSL=1 -I/opt/local/var/macports/build/vde2-devel-2acd721a/work/build/include -I/opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0/include -pipe -Os -DNDEBUG -I/opt/local/include -Wall --std=gnu17 -arch ppc -mmacosx-version-min=10.6 -MD -MT src/common/CMakeFiles/vdecommon.dir/cmdparse.c.o -MF CMakeFiles/vdecommon.dir/cmdparse.c.o.d -o CMakeFiles/vdecommon.dir/cmdparse.c.o -c /opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0/src/common/cmdparse.c
[  2%] Building C object src/common/CMakeFiles/vdecommon.dir/canonicalize.c.o
cd /opt/local/var/macports/build/vde2-devel-2acd721a/work/build/src/common && /opt/local/bin/gcc-mp-14 -DLOCALSTATEDIR=\"/var\" -DSYSCONFDIR=\"/etc\" -DUSE_WOLFSSL=1 -I/opt/local/var/macports/build/vde2-devel-2acd721a/work/build/include -I/opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0/include -pipe -Os -DNDEBUG -I/opt/local/include -Wall --std=gnu17 -arch ppc -mmacosx-version-min=10.6 -MD -MT src/common/CMakeFiles/vdecommon.dir/canonicalize.c.o -MF CMakeFiles/vdecommon.dir/canonicalize.c.o.d -o CMakeFiles/vdecommon.dir/canonicalize.c.o -c /opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0/src/common/canonicalize.c
[  4%] Building C object src/common/CMakeFiles/vdecommon.dir/open_memstream.c.o
cd /opt/local/var/macports/build/vde2-devel-2acd721a/work/build/src/common && /opt/local/bin/gcc-mp-14 -DLOCALSTATEDIR=\"/var\" -DSYSCONFDIR=\"/etc\" -DUSE_WOLFSSL=1 -I/opt/local/var/macports/build/vde2-devel-2acd721a/work/build/include -I/opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0/include -pipe -Os -DNDEBUG -I/opt/local/include -Wall --std=gnu17 -arch ppc -mmacosx-version-min=10.6 -MD -MT src/common/CMakeFiles/vdecommon.dir/open_memstream.c.o -MF CMakeFiles/vdecommon.dir/open_memstream.c.o.d -o CMakeFiles/vdecommon.dir/open_memstream.c.o -c /opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0/src/common/open_memstream.c
/opt/local/var/macports/build/vde2-devel-2acd721a/work/vde-2-6ad51c2fd557734011c140afc7b502d84cc5d3b0/src/common/open_memstream.c:32:17: error: #if with no expression
   32 | #if HAVE_FUNOPEN
      |                 ^
make[2]: *** [src/common/CMakeFiles/vdecommon.dir/open_memstream.c.o] Error 1
make[2]: Leaving directory `/opt/local/var/macports/build/vde2-devel-2acd721a/work/build'
make[1]: *** [src/common/CMakeFiles/vdecommon.dir/all] Error 2

Read src/common/open_memstream.c around line 32 and the CMake feature-detection output for open_memstream and funopen; reproduce the shown CMake/make build on macOS. Done means the vdecommon target compiles past open_memstream.c without the reported preprocessor error.