I maintain the GNOMEish app deja-dup. I also would like it if GNOME
supported apps that want to stay on a stable compiler during the
cycle.
I use the following macro in acinclude.m4 to allow specifying a
specific valac-X.XX version with a friendly fallback to valac.
In configure.ac:
DD_PROG_VALAC([0.14.0], [valac-0.14 valac])
In acinclude.m4:
AC_DEFUN([DD_PROG_VALAC],
[AC_PATH_PROGS([VALAC], [$2], [])
AS_IF([test -z "$VALAC"],
[AC_MSG_ERROR([No Vala compiler found.])],
[AS_IF([test -n "$1"],
[AC_MSG_CHECKING([$VALAC is at least version $1])
am__vala_version=`$VALAC --version | sed 's/Vala *//'`
AS_VERSION_COMPARE([$1], ["$am__vala_version"],
[AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])
AC_MSG_ERROR([Vala $1 not found.])])])])
])
-mt
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