Invoking AM_GNU_GETTEXT conditionally in configure.ac

[David Bruce]

(Not sure if this is more properly an autoconf question or a gettext question)

I have a two autotools-based projects that use GNU gettext.  The
projects contain an intl subdirectory which is only used for the
Windows build.  For the native Linux builds, the programs use the
external intl code (in glibc, I think) in accordance with guidelines
to avoid duplicating system code.  I have been editing configure.ac by
hand when building for one platform or the other, as I haven't worked
out a way to do this conditionally.

I would like to do something like:

AC_MSG_CHECKING([for native Win32])
case "$host" in
  *-*-mingw*)
    native_win32=yes
    ;;
  *)
    native_win32=no
    ;;
esac
AC_MSG_RESULT([$native_win32])

dnl NOTE - the following conditional does not work.
if test $native_win32 = yes; then
  AM_GNU_GETTEXT
else
  AM_GNU_GETTEXT([external])
fi

However, the conditional doesn't work as I expected.  When building
for Linux, "make" fails with

make[2]: Entering directory `/usr/local/src/git/tuxmath/build/po'
*** error: gettext infrastructure mismatch: using a Makefile.in.in
from gettext version 0.17 but the autoconf macros are from gettext
version
make[2]: *** [check-macro-version] Error 1

If I just use AM_GNU_GETTEXT([external]) without the conditional, it
works fine.  So I guess putting m4 macros inside of these conditionals
must have some sort of side effects I don't understand.

Thanks for any help,

David Bruce