http://bugs.gentoo.org/267445

--- bindings/Java/Makefile.am
+++ bindings/Java/Makefile.am
@@ -70,7 +70,7 @@
 $(java_classes): java_compile
 
 java_compile: $(java_files)
-	$(JAVAC) -d . $(java_files)
+	$(JAVAC) $(JAVACFLAGS) -d . $(java_files)
 
 java_lib: libjpisock.c
 	$(CXX) $(INCLUDES) -fPIC $(DEFS) -L $(top_builddir)/libpisock/.libs -lpisock -shared -o libjpisock.so $(srcdir)/libjpisock.c