1 files changed, 5 insertions, 0 deletions

diff --git a/src/s/isc3-0.h b/src/s/isc3-0.h
index cb75a8fb19a..14ef86f1ff3 100644
--- a/src/s/isc3-0.h
+++ b/src/s/isc3-0.h
@@ -15,3 +15,8 @@
 /* People say that using -traditional causes lossage with `const',
    so we might as well try getting rid of -traditional.  */
 #undef C_SWITCH_SYSTEM
+
+/* Martin Tomes <mt00@controls.eurotherm.co.uk> says that ISC has no
+   libX11_s, as specified in s/usg5-3.h.  */
+#undef LIB_X11_LIB
+