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+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_java_check_class.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_JAVA_CHECK_CLASS(<class>,<action-if-found>,<action-if-not-found>)
+#
+# DESCRIPTION
+#
+# Test if a Java class is available. Based on AX_PROG_JAVAC_WORKS. This
+# version uses a cache variable which is both compiler, options and
+# classpath dependent (so if you switch from javac to gcj it correctly
+# notices and redoes the test).
+#
+# The macro tries to compile a minimal program importing <class>. Some
+# newer compilers moan about the failure to use this but fail or produce a
+# class file anyway. All moaing is sunk to /dev/null since I only wanted
+# to know if the class could be imported. This is a recommended followup
+# to AX_CHECK_JAVA_PLUGIN with classpath appropriately adjusted.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Duncan Simpson <dps@simpson.demon.co.uk>
+#
+# 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([DPS_JAVA_CHECK_CLASS], [AX_JAVA_CHECK_CLASS])
+AC_DEFUN([AX_JAVA_CHECK_CLASS],[
+m4_define([cache_val],[m4_translit(ax_cv_have_java_class_$1, " ." ,"__")])
+if test "x$CLASSPATH" != "x"; then
+xtra=" with classpath ${CLASSPATH}"
+xopts=`echo ${CLASSPATH} | ${SED} 's/^ *://'`
+xopts="-classpath $xopts"
+else xtra=""; xopts=""; fi
+cache_var="cache_val"AS_TR_SH([_Jc_${JAVAC}_Cp_${CLASSPATH}])
+AC_CACHE_CHECK([if the $1 class is available$xtra], [$cache_var], [
+JAVA_TEST=Test.java
+CLASS_TEST=Test.class
+cat << \EOF > $JAVA_TEST
+/* [#]xline __oline__ "configure" */
+import $1;
+public class Test {
+}
+EOF
+if AC_TRY_COMMAND($JAVAC $JAVACFLAGS $xopts $JAVA_TEST) >/dev/null 2>&1; then
+ eval "${cache_var}=yes"
+else
+ eval "${cache_var}=no"
+ echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
+ cat $JAVA_TEST >&AS_MESSAGE_LOG_FD
+fi
+rm -f $JAVA_TEST $CLASS_TEST
+])
+if eval 'test "x$'${cache_var}'" = "xyes"'; then
+$2
+true; else
+$3
+false; fi])