diff -ruN wgs-7.0.orig/src/c_make.as wgs-7.0/src/c_make.as
--- wgs-7.0.orig/src/c_make.as	2018-04-29 23:00:02.200181987 +0200
+++ wgs-7.0/src/c_make.as	2018-04-29 23:17:33.612700507 +0200
@@ -196,6 +196,12 @@
 CXXFLAGS        += $(ARCH_CXXFLAGS)
 LDFLAGS         += $(ARCH_LDFLAGS)
 
+# libtirpc
+
+CFLAGS += -I/usr/include/tirpc
+CXXFLAGS += -I/usr/include/tirpc
+LINK_LIBS += -ltirpc
+
 INC_IMPORT_DIRS += $(LOCAL_WORK)/src $(patsubst %, $(LOCAL_WORK)/src/%, $(strip $(SUBDIRS)))
 INC_IMPORT_DIRS += $(ARCH_INC)