AC_CHECK_PROGS([JAR], [jar fastjar gjar], no)
AC_PATH_PROG([ZIP], [zip], no)
AC_PATH_PROG([UNZIP], [unzip], unzip)
+
+# We need a jar that supports -@. This is a GNU extension.
+if test "$JAR" != no; then
+ rm -f config-test.jar
+ echo $srcdir/configure.ac | $JAR -cf@ config-test.jar
+ if test -f config-test.jar; then
+ rm -f config-test.jar
+ else
+ JAR=no
+ fi
+fi
+
# Prefer the jar we found, but fall back to our jar script.
if test "$JAR" = no; then
if test "$ZIP" = no; then