evolution: fixed by adding a workaround to find mono headers and libs properly

gnome2/evolution/evolution.conf

@@ -20,7 +20,12 @@ var_append confopt ' ' '--enable-nntp=yes'
 pkginstalled gnome-pilot-conduits && var_append confopt ' ' '--enable-pilot-conduits=yes'
 
 # Add Mono embedded hooks.
-pkginstalled mono && var_append confopt ' ' "--enable-mono"
+if pkginstalled -f mono; then
+	var_append confopt ' ' "--enable-mono"
+	# workaround to find mono headers and libs
+	mono_majorver="$( pkgprefix ver mono | cut -d '.' -f1)"
+	var_append CC_WRAPPER_APPEND ' ' "$( pkg-config --cflags --libs mono-$mono_majorver )"
+fi
 
 # Add python embedded hooks.
 if pkginstalled -f python; then