Index: Makefile
--- Makefile.orig
+++ Makefile
@@ -16,10 +16,10 @@ DIST = SGMLSpm-1.03ii.tar.gz
 PERL = /usr/bin/perl
 
 # Where do you want the sgmlspl executable script to be installed?
-BINDIR = /usr/local/bin
+BINDIR ?= ${PREFIX}/bin
 
 # Where do you put local perl5 libaries?
-PERL5DIR = /usr/local/lib/perl5
+PERL5DIR ?= ${PREFIX}/libdata/perl5/site_perl
 MODULEDIR = ${PERL5DIR}/SGMLS
 
 # Where do you want to put sgmlspl specifications?
