--- a/Makefile
+++ b/Makefile
@@ -87,7 +87,7 @@ ifeq ($(CC),icc)
 	CFLAGS += -mtune=core2 -march=core2
 endif
 
-LIBS += -lecm -lgmp
+LIBS += -lecm -lgmp -lgomp
 
 CFLAGS += $(OPT_FLAGS) $(WARN_FLAGS) $(INC)