Only accept bison as yacc tool

Others like byacc barf on some of the directives like %error-verbose.

diff --git a/configure.ac b/configure.ac
index d8ab968..e704b7f 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -41,7 +41,7 @@ if test "$LEX" = :; then
        AC_MSG_ERROR([flex not found but required])
 fi
 
-AC_CHECK_PROGS(YACC, 'bison -y' byacc yacc, :)
+AC_CHECK_PROGS(YACC, 'bison -y', :)
 if test "$YACC" = :; then
        AC_MSG_ERROR([bison not found but required])
 fi