1 files changed, 16 insertions, 1 deletions

diff --git a/src/s/isc4-0.h b/src/s/isc4-0.h
index 77c52d1fc98..a52e0d821ef 100644
--- a/src/s/isc4-0.h
+++ b/src/s/isc4-0.h
@@ -1,6 +1,11 @@
 #include "isc3-0.h"
 
-#define LIBS_SYSTEM -linet
+#undef LIBS_SYSTEM
+#ifdef HAVE_X_WINDOWS
+#define LIBS_SYSTEM -linet -lcposix
+#else
+#define LIBS_SYSTEM -lcposix
+#endif
 
 #define ISC4_0
 
@@ -10,3 +15,13 @@
 #undef LIBX11_SYSTEM
 #define LIBX11_SYSTEM -lpt -lnls -lnsl_s -lcposix -lc
 #endif
+
+/* Tobias Herbert <herbert@clipper.ikp.physik.th-darmstadt.de>
+   says this is needed.  */
+
+#ifndef sigblock
+#ifndef SIG_BLOCK
+#define SIG_BLOCK 0
+#endif
+#define sigblock(sig) (sigprocmask (SIG_BLOCK, SIGEMPTYMASK | sig, NULL))
+#endif