libquicktime: allowed to build without doxygen

multimedia/libquicktime/libquicktime.conf

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../libquicktime/libquicktime.conf
-# Copyright (C) 2007 The OpenSDE Project
+# Copyright (C) 2007 - 2009 The OpenSDE Project
 #
 # More information can be found in the files COPYING and README.
 #
@@ -13,3 +13,7 @@
 # --- SDE-COPYRIGHT-NOTE-END ---
 
 var_append GCC_WRAPPER_REMOVE " " "-DGTK_DISABLE_DEPRECATED"
+
+if ! pkginstalled doxygen ; then
+        var_append confopt ' ' '--without-doxygen'
+fi