[PATCH] configure.ac: Fix compatibility for older pkg-config versions

[Peter Hutterer]

On Thu, Dec 03, 2015 at 01:43:44PM -0800, Bryce Harrington wrote:
> noarch_pkgconfigdir is not available on oldish pkg-config's.  Among
> other things this affects Wayland's nightly auto-build Ubuntu 14.04
> PPAs.
> 
> Signed-off-by: Bryce Harrington <bryce at osg.samsung.com>
> Cc: Pekka Paalanen <ppaalanen at gmail.com>
> Cc: Quentin Glidic <sardemff7+wayland at sardemff7.net>
> ---
>  compat.m4    | 9 +++++++++
>  configure.ac | 2 ++
>  2 files changed, 11 insertions(+)
>  create mode 100644 compat.m4
> 
> diff --git a/compat.m4 b/compat.m4
> new file mode 100644
> index 0000000..d036f4d
> --- /dev/null
> +++ b/compat.m4
> @@ -0,0 +1,9 @@
> +m4_ifndef([PKG_INSTALLDIR], [AC_DEFUN([PKG_INSTALLDIR], [
> +    pkgconfigdir='${libdir}'/pkgconfig
> +    AC_SUBST([pkgconfigdir])
> +])])
> +
> +m4_ifndef([PKG_NOARCH_INSTALLDIR], [AC_DEFUN([PKG_NOARCH_INSTALLDIR], [
> +    noarch_pkgconfigdir='${datadir}'/pkgconfig
> +    AC_SUBST([noarch_pkgconfigdir])
> +])])

please add comments here to note why they're required and what obsoletes
them. It'll save time down the road when we're trying to figure out which
functions are still needed and which ones can be dropped, etc.

Cheers,
   Peter

> diff --git a/configure.ac b/configure.ac
> index 93688d0..eeb95ef 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -11,6 +11,8 @@ AC_INIT([wayland-protocols],
>          [wayland-protocols],
>          [http://wayland.freedesktop.org/])
>  
> +m4_include(compat.m4)
> +
>  AC_SUBST([WAYLAND_PROTOCOLS_VERSION], [wayland_protocols_version])
>  
>  AM_INIT_AUTOMAKE([1.11 foreign no-dist-gzip dist-xz])
> -- 
> 1.9.1
> 
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