I'm building gnome-menus via JHBuild. gnome-menus builds
successfully. If upstream then updates configure.in, then I run 'make', which
attempts a reconfigure, but fails.

This is because JHBuild sets ACLOCAL_FLAGS to include the sandbox (e.g. -I
/opt/gnome/share/aclocal). One may argue it is silly for JHBuild to require
every module to support ACLOCAL_FLAGS, but there isn't a way around it until
automake-1.12 is out - which includes support for ACLOCAL_PATH. Further details
in the JHBuild bug 634617.

The build failure is:
make  V=1
CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/sh /home/Oxyde/gnome/libgnomekbd/missing --run aclocal-1.11 -I m4
configure.in:48: warning: macro `AM_GLIB_GNU_GETTEXT' not found in library
configure.in:4: warning: AC_INIT: not a literal: http://bugzilla.gnome.org/enter_bug.cgi?product=libgnomekbd
 cd . && /bin/sh /home/Oxyde/gnome/libgnomekbd/missing --run automake-1.11 --gnu
configure.in:4: warning: AC_INIT: not a literal: http://bugzilla.gnome.org/enter_bug.cgi?product=libgnomekbd
libgnomekbd/Makefile.am:147: HAVE_INTROSPECTION does not appear in AM_CONDITIONAL
make: *** [Makefile.in] Error 1