The ld in Linux complains about not being able to find the shared libc library
Apply this patch.
diff -c -r1.14 Makefile
*** 1.14 1995/05/18 00:02:03
--- Makefile 1995/05/18 23:48:00
***************
*** 93,98 ****
--- 93,105 ----
#
LDADD+= -lm
+ # statically link in libc for linux
+ ifeq ($(PORTNAME), linux)
+ LDADD+= -lc
+ endif
+
+
+
postgres: $(POSTGRES_DEPEND) $(OBJS) $(EXPORTS)
$(CC) $(LDFLAGS) -o $(objdir)/$(@F) $(addprefix $(objdir)/,$(notdir $(OBJS))) $(LDADD)