$NetBSD$
--- ylwrap.amd.orig 2014-10-30 14:37:46.000000000 +0000
+++ ylwrap.amd
@@ -173,7 +173,7 @@ case "$prog" in
flags="-P${prefix}"
out="mv lex.$prefix.c lex.yy.c"
;;
-yacc|bison)
+*yacc|*bison)
flags="-p $prefix";;
esac