diff --git a/yacc/Makefile b/yacc/Makefile
index 3e9d573..ce9a420 100644
--- a/yacc/Makefile
+++ b/yacc/Makefile
@@ -6,5 +6,10 @@ TARG      = yacc
 include ../std.mk
 
 pre-uninstall:
+	rm -f ${DESTDIRK}${PREFIX}/yacc/yaccpar
+	rm -f ${DESTDIRK}${PREFIX}/yacc/yaccpars
 
 post-install:
+	@mkdir -p ${DESTDIR}${PREFIX}/yacc
+	@cp yaccpar ${DESTDIR}${PREFIX}/yacc/
+	@cp yaccpars ${DESTDIR}${PREFIX}/yacc/