Remove pre-generated dependency files and make `make depend' really work.

gnu/usr.bin/groff/Makefile.cfg

@@ -17,6 +17,9 @@ LIBBIB=		$(.CURDIR)/../libbib/obj/libbib.a
 LIBBIB=		$(.CURDIR)/../libbib/libbib.a
 .endif
 
+.if target(depend)
+CFLAGS+=	-+
+.endif
 CFLAGS+=	-DHAVE_UNISTD_H=1\
 		-DHAVE_DIRENT_H=1\
 		-DHAVE_LIMITS_H=1\
@@ -34,26 +37,12 @@ CFLAGS+=	-DHAVE_UNISTD_H=1\
 		-DHAVE_SYS_SIGLIST=1\
 		-DARRAY_DELETE_NEEDS_SIZE=1
 
-# Since we are still using gcc-1.X, we have to play games to ensure *.c
-# files are compiled by gcc, *.cc files are compiled by g++, and everything
-# is linked with g++.
-CCC=		gcc
-CXX=		g++
+# Just use C++ compiler for everything.
 CC=		$(CXX)
 
-.SUFFIXES:	.cc 
-.c.o:
-	$(CCC) $(CFLAGS) -c $(.IMPSRC)
-
-.cc.o:
-	$(CXX) $(CFLAGS) -c $(.IMPSRC)
-
 .y.cc:
 	$(YACC) $(YFLAGS) $(.IMPSRC)
 	mv y.tab.c $(.PREFIX).cc
 	mv y.tab.h $(.PREFIX).tab.h
 
-# include dependancies
-.if exists($(.CURDIR)/Makefile.dep)
-.include "$(.CURDIR)/Makefile.dep"
-.endif
+.include <bsd.prog.mk>