ui/gtk: require at least GTK 2.18 and VTE 0.26

This gives us the bare amount of features we need.  We can add work arounds
for older versions and lower the requirement but this should be a good
starting point.

Suggested-by: Daniel Berrange <berrange@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
v1 -> v2
 - tremendous simplification suggested by danpb

diff --git a/configure b/configure
index 0dadd31a3a317ea5dfaba80d6646811701397261..0eb25dd77c25783c82541e81173f4b695c7f46c0 100755 (executable)
--- a/configure
+++ b/configure
@@ -1644,8 +1644,8 @@ fi
 # GTK probe
 
 if test "$gtk" != "no"; then
-    if $pkg_config gtk+-2.0 --modversion >/dev/null 2>/dev/null && \
-       $pkg_config vte --modversion >/dev/null 2>/dev/null; then
+    if $pkg_config --exists 'gtk+-2.0 >= 2.18.0' && \
+       $pkg_config --exists 'vte >= 0.26.0'; then
        gtk_cflags=`$pkg_config --cflags gtk+-2.0 2>/dev/null`
        gtk_libs=`$pkg_config --libs gtk+-2.0 2>/dev/null`
        vte_cflags=`$pkg_config --cflags vte 2>/dev/null`