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+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_prog_javac.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_PROG_JAVAC
+#
+# DESCRIPTION
+#
+# AX_PROG_JAVAC tests an existing Java compiler. It uses the environment
+# variable JAVAC then tests in sequence various common Java compilers. For
+# political reasons, it starts with the free ones.
+#
+# If you want to force a specific compiler:
+#
+# - at the configure.in level, set JAVAC=yourcompiler before calling
+# AX_PROG_JAVAC
+#
+# - at the configure level, setenv JAVAC
+#
+# You can use the JAVAC variable in your Makefile.in, with @JAVAC@.
+#
+# *Warning*: its success or failure can depend on a proper setting of the
+# CLASSPATH env. variable.
+#
+# TODO: allow to exclude compilers (rationale: most Java programs cannot
+# compile with some compilers like guavac).
+#
+# Note: This is part of the set of autoconf M4 macros for Java programs.
+# It is VERY IMPORTANT that you download the whole set, some macros depend
+# on other. Unfortunately, the autoconf archive does not support the
+# concept of set of macros, so I had to break it for submission. The
+# general documentation, as well as the sample configure.in, is included
+# in the AX_PROG_JAVA macro.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Stephane Bortzmeyer <bortzmeyer@pasteur.fr>
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+
+#serial 7
+
+AU_ALIAS([AC_PROG_JAVAC], [AX_PROG_JAVAC])
+AC_DEFUN([AX_PROG_JAVAC],[
+m4_define([m4_ax_prog_javac_list],["gcj -C" guavac jikes javac])dnl
+AS_IF([test "x$JAVAPREFIX" = x],
+ [test "x$JAVAC" = x && AC_CHECK_PROGS([JAVAC], [m4_ax_prog_javac_list])],
+ [test "x$JAVAC" = x && AC_CHECK_PROGS([JAVAC], [m4_ax_prog_javac_list], [], [$JAVAPREFIX/bin])])
+m4_undefine([m4_ax_prog_javac_list])dnl
+test "x$JAVAC" = x && AC_MSG_ERROR([no acceptable Java compiler found in \$PATH])
+AX_PROG_JAVAC_WORKS
+AC_PROVIDE([$0])dnl
+])