http://bugs.gentoo.org/442226

--- progsreiserfs.m4
+++ progsreiserfs.m4
@@ -10,7 +10,7 @@
 dnl Adds the required libraries to $REISERFS_LIBS and does an
 dnl AC_SUBST(REISERFS_LIBS)
 
-AC_DEFUN(AC_CHECK_LIBREISERFS,
+AC_DEFUN([AC_CHECK_LIBREISERFS],
 [
 
 dnl save LIBS