We are changing the javac -soure value from 1.4 to 1.8 which is supported by all
Java versions presently available in ::gentoo.

TODO: configure.ac
Replace '1.8' with a variable to be set with $(java-pkg_get-source) in the ebuild.

TODO java/Makefile.am
Replace fixed values in
	$(JAVAC) -source 1.8 -target 1.8 `for file in $(JAVASOURCES); do echo ThePEG/$$file; done`
with values from java-pkg_get-source and java-pkg_get-target

--- a/configure.ac
+++ b/configure.ac
@@ -123,7 +123,7 @@ AC_ARG_WITH(javagui,
             [  --with-javagui          Compile and install the java-based GUI.])
 
 if test "x$with_javagui" != "xno"; then
-  THEPEG_HAS_JAVA([1.4], [], [with_javagui=no; AC_MSG_NOTICE([Java GUI disabled])])
+  THEPEG_HAS_JAVA([1.8], [], [with_javagui=no; AC_MSG_NOTICE([Java GUI disabled])])
 fi
 
 AM_CONDITIONAL([JAVAGUI], [test "x$with_javagui" != "xno"])
--- a/java/Makefile.am
+++ b/java/Makefile.am
@@ -11,8 +12,7 @@ JAVASOURCES = SetupThePEG.java ObjectFrame.java \
 
 CLEANFILES = ThePEG.jar thepeg.sh
 
-jardir = $(pkglibdir)
-nodist_jar_DATA = ThePEG.jar
+noinst_DATA = ThePEG.jar
 
 dist_noinst_DATA = $(JAVASOURCES) jar-manifest
 
@@ -27,14 +27,14 @@ clean-local:
 ThePEG:
 	mkdir -p ThePEG
 	for file in $(JAVASOURCES) jar-manifest; do \
-           cd ThePEG; $(LN_S) ../$(srcdir)/$$file $$file; cd ..; done
+           cd ThePEG; cp ../$(srcdir)/$$file $$file; cd ..; done
 
 ThePEG.jar: ThePEG $(JAVASOURCES)
-	$(JAVAC) `for file in $(JAVASOURCES); do echo ThePEG/$$file; done`
+	$(JAVAC) -source 1.8 -target 1.8 `for file in $(JAVASOURCES); do echo ThePEG/$$file; done`
 	$(JAR) cmf ThePEG/jar-manifest ThePEG.jar ThePEG/*.class
 
 thepeg.sh: thepeg.install Makefile
-	sed -e s:@pkglibdir[@]:$(pkglibdir):g \
+	sed -e s:@datadir[@]:$(datadir):g \
             -e s:@bindir[@]:$(bindir):g \
             -e s:@java[@]:$(JAVA):g $(srcdir)/thepeg.install > thepeg.sh
 	chmod +x thepeg.sh
--- a/java/thepeg.install
+++ b/java/thepeg.install
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-pkglibdir=@pkglibdir@
+source @datadir@/thepeg/package.env
 bindir=@bindir@
 
 ThePEG_CMD="${bindir}/setupThePEG"
@@ -19,4 +19,4 @@
 
 
 
-exec @java@ ${HEADLESS} -jar ${pkglibdir}/ThePEG.jar ${ThePEG_CMD} "$@"
+exec @java@ ${HEADLESS} -jar ${CLASSPATH} ${ThePEG_CMD} "$@"