Fool-proofing Makefiles

crypto/md2/Makefile

@@ -7,10 +7,6 @@ TOP=	../..
 CC=	cc
 INCLUDES=
 CFLAG=-g
-INSTALL_PREFIX=
-OPENSSLDIR=     /usr/local/ssl
-INSTALLTOP=/usr/local/ssl
-MAKE=		make
 MAKEDEPPROG=	makedepend
 MAKEDEPEND=	$(TOP)/util/domd $(TOP) -MD $(MAKEDEPPROG)
 MAKEFILE=	Makefile
@@ -52,6 +48,7 @@ links:
 	@$(PERL) $(TOP)/util/mklink.pl ../../apps $(APPS)
 
 install:
+	@[ -n "$(INSTALLTOP)" ] # should be set by top Makefile...
 	@headerlist="$(EXHEADER)"; for i in $$headerlist ; \
 	do  \
 	(cp $$i $(INSTALL_PREFIX)$(INSTALLTOP)/include/openssl/$$i; \