This breaks the build.

% head config.log
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by gpgme configure 1.6.1-beta36, which was
generated by GNU Autoconf 2.69. Invocation command line was

  $ ./configure

1. --------- ##
2. Platform. ##

% make -C doc
make: Entering directory '/tmp/gpgme/doc'
restore=: && backupdir=".am$$" && \
am__cwd=pwd && CDPATH="${ZSH_VERSION+.}:" && cd . && \
rm -rf $backupdir && mkdir $backupdir && \
if (/bin/bash /tmp/gpgme/build-aux/missing makeinfo --version) >/dev/null 2>&1;
then \

for f in gpgme.info gpgme.info-[0-9] gpgme.info-[0-9][0-9] gpgme.i[0-9]

gpgme.i[0-9][0-9]; do \

  if test -f $f; then mv $f $backupdir; restore=mv; else :; fi; \
done; \

else :; fi && \
cd "$am__cwd"; \
if /bin/bash /tmp/gpgme/build-aux/missing makeinfo -I . \
-o gpgme.info gpgme.texi; \
then \

rc=0; \
CDPATH="${ZSH_VERSION+.}:" && cd .; \

else \

rc=$?; \
CDPATH="${ZSH_VERSION+.}:" && cd . && \
$restore $backupdir/* `echo "./gpgme.info" | sed 's|[^/]*$||'`; \

fi; \
rm -rf $backupdir; exit $rc
gpgme.texi:33: @include: could not find version.texi
gpgme.texi:50: warning: undefined flag: EDITION
gpgme.texi:50: warning: undefined flag: UPDATED
gpgme.texi:52: warning: undefined flag: VERSION
gpgme.texi:68: warning: undefined flag: EDITION
gpgme.texi:70: warning: undefined flag: UPDATED
gpgme.texi:72: warning: undefined flag: VERSION
gpgme.texi:87: warning: undefined flag: EDITION
gpgme.texi:87: warning: undefined flag: UPDATED
gpgme.texi:89: warning: undefined flag: VERSION
Makefile:431: recipe for target 'gpgme.info' failed
make: *** [gpgme.info] Error 1
make: Leaving directory '/tmp/gpgme/doc'