# Also avoid versions of m4 that trigger strstr bugs.
AC_DEFUN([AC_PROG_GNU_M4],
[AC_ARG_VAR([M4], [Location of GNU M4 1.4.6 or later. Defaults to the first
- program of `m4', `gm4', or `gnum4' on PATH that meets Autoconf needs.])
+ program of 'm4', 'gm4', or 'gnum4' on PATH that meets Autoconf needs.])
AC_CACHE_CHECK([for GNU M4 that supports accurate traces], [ac_cv_path_M4],
[rm -f conftest.m4f
ac_had_posixly_correct=${POSIXLY_CORRECT:+yes}