Move to here from configure.in.

tests/configure.ac

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+dnl autoconf configuration for gperf/tests
+
+dnl Copyright (C) 1998, 2002 Free Software Foundation, Inc.
+dnl Written by Douglas C. Schmidt <schmidt@ics.uci.edu>
+dnl and Bruno Haible <bruno@clisp.org>.
+dnl
+dnl This file is part of GNU GPERF.
+dnl
+dnl GNU GPERF is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2, or (at your option)
+dnl any later version.
+dnl
+dnl GNU GPERF is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; see the file COPYING.
+dnl If not, write to the Free Software Foundation, Inc.,
+dnl 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+AC_INIT(c-parse.gperf)
+AC_PROG_MAKE_SET
+dnl
+dnl           checks for programs
+dnl
+AC_PROG_CC
+                      dnl sets variable CC
+AC_PROG_CPP
+                      dnl sets variable CPP
+AC_PROG_CXX
+                      dnl sets variable CXX
+AC_PROG_CXXCPP
+                      dnl sets variable CXXCPP
+if test $ac_cv_prog_gcc = yes -a $ac_cv_prog_gxx = yes; then
+  CHECK_LANG_SYNTAX='check-lang-syntax'
+else
+  CHECK_LANG_SYNTAX=''
+fi
+AC_SUBST(CHECK_LANG_SYNTAX)
+dnl
+dnl           That's it.
+dnl
+AC_OUTPUT(Makefile)