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    if test "$where" != "check"; then
      AC_MSG_WARN([no JNI header files found.])
      if test "$os_arch" = "Darwin"; then
        AC_MSG_WARN([You may need to install the latest Java Development package from http://connect.apple.com/.  Apple no longer includes the JNI header files by default on Java updates.])
      fi
    fi
  fi

  if test "$JDK_SUITABLE" = "yes"; then
    JAVA_BIN='$(JDK)/bin'

    JAVA="$JAVA_BIN/java"
    JAVAC="$JAVA_BIN/javac"
    JAVAH="$JAVA_BIN/javah"
    JAVADOC="$JAVA_BIN/javadoc"
    JAR="$JAVA_BIN/jar"

    dnl Prefer Jikes (for speed) if available.
    jikes_options="/usr/local/bin/jikes /usr/bin/jikes"
    AC_ARG_WITH(jikes,
                AS_HELP_STRING([--with-jikes=PATH],
                               [Specify the path to a jikes binary to use
                                it as your Java compiler.  The default is to
                                look for jikes (PATH optional).  This behavior
                                can be switched off by supplying 'no'.]),
    [
        if test "$withval" != "no" && test "$withval" != "yes"; then
          dnl Assume a path was provided.
          jikes_options="$withval $jikes_options"
        fi
        requested_jikes="$withval"  # will be 'yes' if path unspecified
    ])
    if test "$requested_jikes" != "no"; then
      dnl Look for a usable jikes binary.
      for jikes in $jikes_options; do
        if test -z "$jikes_found" && test -x "$jikes"; then
          jikes_found="yes"
          JAVAC="$jikes"
          JAVA_CLASSPATH="$JRE_LIB_DIR"
          for jar in $JRE_LIB_DIR/*.jar; do
            JAVA_CLASSPATH="$JAVA_CLASSPATH:$jar"
          done
        fi
      done
    fi
    if test -n "$requested_jikes" && test "$requested_jikes" != "no"; then
      dnl Jikes was explicitly requested.  Verify that it was provided.
      if test -z "$jikes_found"; then
        AC_MSG_ERROR([Could not find a usable version of Jikes])
      elif test -n "$jikes_found" && test "$requested_jikes" != "yes" &&
           test "$JAVAC" != "$requested_jikes"; then
        AC_MSG_WARN([--with-jikes PATH was invalid, substitute found])
      fi
    fi

    dnl Add javac flags.
    # The release for "-source" could actually be greater than that
    # of "-target", if we want to cross-compile for lesser JVMs.
    if test -z "$JAVAC_FLAGS"; then
      JAVAC_FLAGS="-target $JAVA_OLDEST_WORKING_VER -source 1.5"
      if test "$enable_debugging" = "yes"; then
        JAVAC_FLAGS="-g -Xlint:unchecked $JAVAC_FLAGS"
      fi
    fi

    JNI_INCLUDES="-I$JNI_INCLUDEDIR"
    list="`find "$JNI_INCLUDEDIR" -type d -print`"
    for dir in $list; do
      JNI_INCLUDES="$JNI_INCLUDES -I$dir"
    done
  fi

  dnl We use JDK in the Makefile
  AC_SUBST(JDK)
  AC_SUBST(JAVA)
  AC_SUBST(JAVAC)
  AC_SUBST(JAVAC_FLAGS)
  AC_SUBST(JAVADOC)
  AC_SUBST(JAVAH)
  AC_SUBST(JAR)
  AC_SUBST(JNI_INCLUDES)
])