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+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_check_java_home.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_CHECK_JAVA_HOME
+#
+# DESCRIPTION
+#
+# Check for Sun Java (JDK / JRE) installation, where the 'java' VM is in.
+# If found, set environment variable JAVA_HOME = Java installation home,
+# else left JAVA_HOME untouch, which in most case means JAVA_HOME is
+# empty.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Gleen Salmon <gleensalmon@yahoo.com>
+#
+# 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 6
+
+AU_ALIAS([AC_CHECK_JAVA_HOME], [AX_CHECK_JAVA_HOME])
+
+AC_DEFUN([AX_CHECK_JAVA_HOME],
+[AC_MSG_CHECKING([for JAVA_HOME])
+# We used a fake loop so that we can use "break" to exit when the result
+# is found.
+while true
+do
+ # If the user defined JAVA_HOME, don't touch it.
+ test "${JAVA_HOME+set}" = set && break
+
+ # On Mac OS X 10.5 and following, run /usr/libexec/java_home to get
+ # the value of JAVA_HOME to use.
+ # (http://developer.apple.com/library/mac/#qa/qa2001/qa1170.html).
+ JAVA_HOME=`/usr/libexec/java_home 2>/dev/null`
+ test x"$JAVA_HOME" != x && break
+
+ # See if we can find the java executable, and compute from there.
+ TRY_JAVA_HOME=`ls -dr /usr/java/* 2> /dev/null | head -n 1`
+ if test x$TRY_JAVA_HOME != x; then
+ PATH=$PATH:$TRY_JAVA_HOME/bin
+ fi
+ AC_PATH_PROG([JAVA_PATH_NAME], [java])
+ if test "x$JAVA_PATH_NAME" != x; then
+ JAVA_HOME=`echo $JAVA_PATH_NAME | sed "s/\(.*\)[[/]]bin[[/]]java.*/\1/"`
+ break
+ fi
+
+ AC_MSG_NOTICE([Could not compute JAVA_HOME])
+ break
+done
+AC_MSG_RESULT([$JAVA_HOME])
+])