system/colord: Add auto detection for vala.

Requested by Christoph Willing.

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

system/colord/README

@@ -12,5 +12,4 @@ BASH_COMPLETION=yes ./colord.SlackBuild
 If you want argyllcms support (new dep: argyllcms), use:
 ARGYLL=yes ./colord.SlackBuild
 
-Optional dependency: vala
-
+Optional dependency: vala (autodetected)

system/colord/colord.SlackBuild

@@ -24,7 +24,7 @@
 
 PRGNAM=colord
 VERSION=${VERSION:-1.2.12}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
@@ -80,6 +80,14 @@ else
   argyll="--disable-argyllcms-sensor"
 fi
 
+# Check if VALA exists
+vl=`pkg-config --exists vapigen`
+if [ "$?" -eq 0 ]; then
+  vala="--enable-vala"
+else
+  vala=""
+fi
+
 set -e
 
 rm -rf $PKG
@@ -111,6 +119,7 @@ CXXFLAGS="$SLKCFLAGS" \
   --enable-sane \
   --enable-libcolordcompat \
   $argyll \
+  $vala \
   --disable-systemd-login \
   --with-daemon-user=colord \
   --build=$ARCH-slackware-linux \