Index: gap-4.13.0/Makefile.rules
===================================================================
--- gap-4.13.0.orig/Makefile.rules
+++ gap-4.13.0/Makefile.rules
@@ -672,6 +672,7 @@ install-sysinfo: SYSINFO_CPPFLAGS = -I${
 install-sysinfo: SYSINFO_LDFLAGS = $(ABI_CFLAGS)
 install-sysinfo: SYSINFO_GAP = $(bindir)/gap
 install-sysinfo: SYSINFO_GAC = $(bindir)/gac
+install-sysinfo: GAC_LDFLAGS := $(GAC_LDFLAGS) -lgap
 install-sysinfo: GMP_PREFIX =
 install-sysinfo:
 	$(INSTALL) -d -m 0755 $(DESTDIR)$(libdir)/gap
