# autoheader might not change config.h.in, so touch a stamp file.
${srcdir}/config.h.in: ${srcdir}/stamp-h.in
-${srcdir}/stamp-h.in: configure.in acconfig.h
+${srcdir}/stamp-h.in: configure.in aclocal.m4
cd ${srcdir} && autoheader
echo timestamp > ${srcdir}/stamp-h.in