Compiling JRuby on Java 1.8?

gistfile1.txt

# If you get the following, the solution is to try compiling under Java 1.6
# $ JAVA_HOME=`/usr/libexec/java_home -v 1.6` rvm install jruby-head

compile-jruby:
    [javac] Compiling 1395 source files to /Users/jackdanger/.rvm/src/jruby-head/build/classes/jruby
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 1.6
    [javac] /Users/jackdanger/.rvm/src/jruby-head/src/org/jruby/javasupport/JavaClass.java:1418: error: cannot find symbol
    [javac]         return getRuntime().newBoolean(javaClass().isAnnotationPresent(((JavaClass)annoClass).javaClass()));
    [javac]                                                   ^
    [javac]   symbol:   method isAnnotationPresent(Class)
    [javac]   location: class Class
    [javac] /Users/jackdanger/.rvm/src/jruby-head/src/org/jruby/util/io/IOOptions.java:66: warning: [deprecation] ModeFlags(String) in ModeFlags has been deprecated
    [javac]             modeFlags = new ModeFlags(modeString);
    [javac]                         ^
    [javac] /Users/jackdanger/.rvm/src/jruby-head/src/org/jruby/util/io/IOOptions.java:68: warning: [deprecation] ModeFlags(String) in ModeFlags has been deprecated
    [javac]             modeFlags = new ModeFlags(modeString.substring(0, colonIndex));
    [javac]                         ^
    [javac] /Users/jackdanger/.rvm/src/jruby-head/src/org/jruby/javasupport/JavaAccessibleObject.java:124: error: cannot find symbol
    [javac]         return getRuntime().newBoolean(this.accessibleObject().isAnnotationPresent(((JavaClass) annoClass).javaClass()));
    [javac]                                                               ^
    [javac]   symbol:   method isAnnotationPresent(Class)
    [javac]   location: class AccessibleObject