fix aclocal warning (newer versions are more strict about this)

diff --git a/ext/pdo_mysql/config.m4 b/ext/pdo_mysql/config.m4
index 054803ad95205f6dfad4e612f95e15a80ed0fe0b..086cb4db067977dfd266f714574e45334481488d 100755 (executable)
--- a/ext/pdo_mysql/config.m4
+++ b/ext/pdo_mysql/config.m4
@@ -2,7 +2,7 @@ dnl
 dnl $Id$
 dnl
 
-AC_DEFUN(PDO_MYSQL_LIB_CHK, [
+AC_DEFUN([PDO_MYSQL_LIB_CHK], [
   str="$PDO_MYSQL_DIR/$1/libmysqlclient.*"
   for j in `echo $str`; do
     if test -r $j; then