assuan.h:588:2 invalid preprocessing directive (Re: GnuPG 2.5.5 released)

[Ralph Seichter]

Here's an error I see when attempting to build on macOS:

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/Applications/Xcode.app/Contents/Developer/usr/bin/make  all-recursive
Making all in m4
make[3]: Nothing to be done for `all'.
Making all in common
/Applications/Xcode.app/Contents/Developer/usr/bin/make  all-am
gcc -DHAVE_CONFIG_H -I. -I..  -DLOCALEDIR=\"/usr/local/gnupg-2.5/share/locale\" -DGNUPG_BINDIR="\"/usr/local/gnupg-2.5/bin\"" -DGNUPG_LIBEXECDIR="\"/usr/local/gnupg-2.5/libexec\"" -DGNUPG_LIBDIR="\"/usr/local/gnupg-2.5/lib/gnupg\"" -DGNUPG_DATADIR="\"/usr/local/gnupg-2.5/share/gnupg\"" -DGNUPG_SYSCONFDIR="\"/usr/local/gnupg-2.5/etc/gnupg\"" -DGNUPG_LOCALSTATEDIR="\"/var\"" -DGNUPG_DEFAULT_AGENT="\"/usr/local/gnupg-2.5/bin/gpg-agent\"" -DGNUPG_DEFAULT_PINENTRY="\"/usr/local/gnupg-2.5/bin/pinentry\"" -DGNUPG_DEFAULT_SCDAEMON="\"/usr/local/gnupg-2.5/libexec/scdaemon\""  -DGNUPG_DEFAULT_DIRMNGR="\"/usr/local/gnupg-2.5/bin/dirmngr\"" -DGNUPG_DEFAULT_PROTECT_TOOL="\"/usr/local/gnupg-2.5/libexec/gpg-protect-tool\"" -DGNUPG_DEFAULT_DIRMNGR_LDAP="\"/usr/local/gnupg-2.5/libexec/dirmngr_ldap\"" -arch x86_64 -I/tmp/gpgosx-build-2.5.5/x86_64-dist/include -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -mmacosx-version-min=10.12 -Ofast -I/tmp/gpgosx-build-2.5.5/x86_64-dist/include -I/tmp/gpgosx-build-2.5.5/x86_64-dist/include -I/tmp/gpgosx-build-2.5.5/x86_64-dist/include -I/tmp/gpgosx-build-2.5.5/x86_64-dist/include -I/tmp/gpgosx-build-2.5.5/x86_64-dist/include -DWITHOUT_NPTH=1 -Wall -Wno-pointer-sign -Wpointer-arith -arch x86_64 -m64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -mmacosx-version-min=10.12 -Ofast -MT libcommon_a-sysutils.o -MD -MP -MF .deps/libcommon_a-sysutils.Tpo -c -o libcommon_a-sysutils.o `test -f 'sysutils.c' || echo './'`sysutils.c
In file included from sysutils.c:84:
/tmp/gpgosx-build-2.5.5/x86_64-dist/include/assuan.h:588:2: error: invalid preprocessing directive
  588 | #defined ASSUAN_NO_NPTH_SYSTEM_HOOKS_ANY_MORE 1
      |  ^
1 error generated.
make[4]: *** [libcommon_a-sysutils.o] Error 1
make[3]: *** [all] Error 2
make[2]: *** [all-recursive] Error 1
make[1]: *** [all] Error 2

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Detailed build logs are available, should you need them.

-Ralph