+AC_ARG_WITH(userdir,[
+ --with-userdir=(dirname) Relative path to user directory],[
+],[
+case "$host" in
+ *mingw* | *cygwin*)
+ with_userdir="Synfig"
+ ;;
+ *darwin*)
+ with_userdir="Library/Synfig"
+ ;;
+ *)
+ with_userdir="Synfig"
+ ;;
+esac
+])
+AC_DEFINE_UNQUOTED(SYNFIG_USER_APP_DIR,"$with_userdir",[Synfig User Data Directory])