--- a/lwlib/config.h.in	Mon Aug 13 11:12:06 2007 +0200
+++ b/lwlib/config.h.in	Mon Aug 13 11:13:30 2007 +0200
@@ -29,4 +29,19 @@
 #undef NEED_ATHENA
 #undef NEED_LUCID
 
+/* The path to the Athena widgets - the usual value is `X11/Xaw' */
+#undef ATHENA_H_PATH
+
+/* For use in #include statements.
+   You can't use macros directly within the <> of a #include statement.
+   The multiply nested macros are necessary to make old gcc's happy.
+   However, those nested macros are too much for AIX xlc to deal with. */
+#if defined(_AIX) && !defined(__GNUC__)
+#define ATHENA_INCLUDE(header_file) <ATHENA_H_PATH/header_file>
+#else
+#define INCLUDE_GLUE_2(dirname,basename) <##dirname##/##basename##>
+#define INCLUDE_GLUE_1(dirname,basename) INCLUDE_GLUE_2(dirname,basename)
+#define ATHENA_INCLUDE(header_file) INCLUDE_GLUE_1(ATHENA_H_PATH,header_file)
+#endif
+
 #endif /* _LWLIB_CONFIG_H_ */