build: At least valac 0.16.1 is required

autogen.sh

@@ -7,12 +7,12 @@ ORIGDIR=`pwd`
 cd $srcdir
 
 test -z "$VALAC" && VALAC=valac
-if ! $VALAC --version | sed -e 's/^Vala \([0-9]\+\.[0-9]\+\).*$/\1/' | grep -vq '^0\.\([0-9]\|1[0-1]\)$'
+if ! $VALAC --version | sed -e 's/^Vala \([0-9]\+\.[0-9]\+\).*$/\1/' | grep -vq '^0\.\([0-9]\|1[0-5]\)$'
 then
-    echo "**Error**: You must have valac >= 0.12.0 installed"
+    echo "**Error**: You must have valac >= 0.16.1 installed"
     echo "  to build vala. Download the appropriate package"
     echo "  from your distribution or get the source tarball at"
-    echo "  http://download.gnome.org/sources/vala/"
+    echo "  https://download.gnome.org/sources/vala/"
     exit 1
 fi