diff -ru stfl-0.24.orig/Makefile stfl-0.24/Makefile
--- stfl-0.24.orig/Makefile	2015-02-12 14:14:33.000000000 +0100
+++ stfl-0.24/Makefile	2020-09-07 14:08:04.125833347 +0200
@@ -67,7 +67,7 @@
 	ln -fs libstfl.so.$(VERSION) $(DESTDIR)$(prefix)/$(libdir)/libstfl.so
 
 stfl.pc: stfl.pc.in
-	sed 's,@VERSION@,$(VERSION),g' < $< | sed 's,@PREFIX@,$(prefix),g' > $@
+	sed 's,@VERSION@,$(VERSION),g' < $< | sed 's,@PREFIX@,$(prefix),g' | sed 's,@LIBDIR@,${libdir},g' > $@
 
 ifeq ($(FOUND_SPL),1)
 include spl/Makefile.snippet
diff -ru stfl-0.24.orig/stfl.pc.in stfl-0.24/stfl.pc.in
--- stfl-0.24.orig/stfl.pc.in	2009-03-30 20:33:37.000000000 +0200
+++ stfl-0.24/stfl.pc.in	2020-09-07 14:08:07.784854088 +0200
@@ -2,7 +2,7 @@
 
 prefix=@PREFIX@
 exec_prefix=${prefix}
-libdir=${exec_prefix}/lib
+libdir=${exec_prefix}/@LIBDIR@
 includedir=${prefix}/include
 
 Name: STFL