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+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_prog_java.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_PROG_JAVA
+#
+# DESCRIPTION
+#
+# Here is a summary of the main macros:
+#
+# AX_PROG_JAVAC: finds a Java compiler.
+#
+# AX_PROG_JAVA: finds a Java virtual machine.
+#
+# AX_CHECK_CLASS: finds if we have the given class (beware of CLASSPATH!).
+#
+# AX_CHECK_RQRD_CLASS: finds if we have the given class and stops
+# otherwise.
+#
+# AX_TRY_COMPILE_JAVA: attempt to compile user given source.
+#
+# AX_TRY_RUN_JAVA: attempt to compile and run user given source.
+#
+# AX_JAVA_OPTIONS: adds Java configure options.
+#
+# AX_PROG_JAVA tests an existing Java virtual machine. It uses the
+# environment variable JAVA then tests in sequence various common Java
+# virtual machines. For political reasons, it starts with the free ones.
+# You *must* call [AX_PROG_JAVAC] before.
+#
+# If you want to force a specific VM:
+#
+# - at the configure.in level, set JAVA=yourvm before calling AX_PROG_JAVA
+#
+# (but after AC_INIT)
+#
+# - at the configure level, setenv JAVA
+#
+# You can use the JAVA variable in your Makefile.in, with @JAVA@.
+#
+# *Warning*: its success or failure can depend on a proper setting of the
+# CLASSPATH env. variable.
+#
+# TODO: allow to exclude virtual machines (rationale: most Java programs
+# cannot run with some VM like kaffe).
+#
+# 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.
+#
+# A Web page, with a link to the latest CVS snapshot is at
+# <http://www.internatif.org/bortzmeyer/autoconf-Java/>.
+#
+# This is a sample configure.in Process this file with autoconf to produce
+# a configure script.
+#
+# AC_INIT(UnTag.java)
+#
+# dnl Checks for programs.
+# AC_CHECK_CLASSPATH
+# AX_PROG_JAVAC
+# AX_PROG_JAVA
+#
+# dnl Checks for classes
+# AX_CHECK_RQRD_CLASS(org.xml.sax.Parser)
+# AX_CHECK_RQRD_CLASS(com.jclark.xml.sax.Driver)
+#
+# AC_OUTPUT(Makefile)
+#
+# 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 9
+
+AU_ALIAS([AC_PROG_JAVA], [AX_PROG_JAVA])
+AC_DEFUN([AX_PROG_JAVA],[
+m4_define([m4_ax_prog_java_list], [kaffe java])dnl
+AS_IF([test "x$JAVAPREFIX" = x],
+ [test x$JAVA = x && AC_CHECK_PROGS([JAVA], [m4_ax_prog_java_list])],
+ [test x$JAVA = x && AC_CHECK_PROGS([JAVA], [m4_ax_prog_java_list], [], [$JAVAPREFIX/bin])])
+test x$JAVA = x && AC_MSG_ERROR([no acceptable Java virtual machine found in \$PATH])
+m4_undefine([m4_ax_prog_java_list])dnl
+AX_PROG_JAVA_WORKS
+AC_PROVIDE([$0])dnl
+])