--- trafficserver-9.1.2.orig/lib/perl/Makefile.in
+++ trafficserver-9.1.2/lib/perl/Makefile.in
@@ -696,7 +696,7 @@
 # copy them to the build directory if we are building out of tree.
 Makefile-pl: Makefile.PL $(top_builddir)/config.status
 	test -f "$(top_builddir)/$(subdir)/Makefile.PL" || cp -rf "$(srcdir)/." "$(top_builddir)/$(subdir)/"
-	$(PERL) Makefile.PL INSTALLDIRS=$(INSTALLDIRS) INSTALL_BASE=$(prefix) PREFIX=
+	$(PERL) Makefile.PL INSTALLDIRS=$(INSTALLDIRS) INSTALL_BASE= PREFIX=$(prefix)
 
 clean-local:
 	-rm -f Makefile-pl