+# Test for windowing system
+case "${host}" in
+ *mingw32*) SYS="WIN" ;;
+ *cygwin*) SYS="WIN" ;;
+ *apple*) SYS="MAC" ;;
+ *) SYS="X11" ;;
+esac
+AM_CONDITIONAL([SYS_WIN], test "$SYS" = "WIN")
+AM_CONDITIONAL([SYS_MAC], test "$SYS" = "MAC")
+AM_CONDITIONAL([SYS_X11], test "$SYS" = "X11")
+
+# Check for Mac OX
+if test "$SYS" = "MAC"; then
+ PKG_CHECK_MODULES(MAC, gtk-mac-integration)
+fi
+
+# Check for relative build
+AC_ARG_ENABLE(relative, [AS_HELP_STRING([--enable-relative],
+ [enable runtime search paths @<:@default=no@:>@])],
+ [DOTS=".."; ac_default_prefix="/"])
+AC_SUBST([DOTS])
+
+# Output