warnings: avoid warnings from clang

[bison.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index b9d2ea69798e4fa9fd01b665eea6c63a2e7e55e2..4cc9ef91a3c34c41f666d32fd6effd53eb8920f3 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -123,6 +123,10 @@ AC_PROG_GNU_M4
 AC_DEFINE_UNQUOTED([M4], ["$M4"], [Define to the GNU M4 executable name.])
 AC_DEFINE_UNQUOTED([M4_GNU_OPTION], ["$M4_GNU"], [Define to "-g" if GNU M4
 supports -g, otherwise to "".])
+AC_PATH_PROG([PERL], [perl])
+if test -z "$PERL"; then
+   AC_MSG_ERROR([perl not found])
+fi
 AM_MISSING_PROG([HELP2MAN], [help2man])
 AC_PATH_PROG([XSLTPROC], [xsltproc])
 AC_SUBST([XSLTPROC])