diff -Naur a/Makefile.am b/Makefile.am
--- a/Makefile.am	2019-04-05 09:34:16.000000000 +0100
+++ b/Makefile.am	2019-04-14 20:30:19.570385252 +0100
@@ -239,10 +239,10 @@
 awt_src = java-$(BDJ_TYPE)
 endif
 
-jardir=$(datadir)/java/
+jardir=$(datadir)/libbluray/lib/
 jar_DATA = \
-	$(top_builddir)/.libs/libbluray-$(BDJ_TYPE)-$(VERSION).jar \
-	$(top_builddir)/.libs/libbluray-awt-$(BDJ_TYPE)-$(VERSION).jar
+	$(top_builddir)/.libs/libbluray-$(BDJ_TYPE)-gentoo.jar \
+	$(top_builddir)/.libs/libbluray-awt-$(BDJ_TYPE)-gentoo.jar
 
 $(jar_DATA): all-local
 
@@ -253,13 +253,13 @@
 	    -Dsrc_awt=:$(awt_src) \
 	    $(java_versions) \
 	    -Dbootclasspath="$(BDJ_BOOTCLASSPATH)" \
-	    -Dversion='$(BDJ_TYPE)-$(VERSION)'
+	    -Dversion='$(BDJ_TYPE)-gentoo'
 
 clean-local:
 	ant -f $(top_srcdir)/src/libbluray/bdj/build.xml \
 	    -Dbuild='$(abs_builddir)/src/libbluray/bdj/build' \
 	    -Ddist='$(abs_builddir)/.libs' \
-	    -Dversion='$(BDJ_TYPE)-$(VERSION)' \
+	    -Dversion='$(BDJ_TYPE)-gentoo' \
 	    clean
 endif
 
diff -Naur a/src/libbluray/bdj/bdj.c b/src/libbluray/bdj/bdj.c
--- a/src/libbluray/bdj/bdj.c	2019-04-05 09:34:16.000000000 +0100
+++ b/src/libbluray/bdj/bdj.c	2019-04-14 20:21:01.927193454 +0100
@@ -22,6 +22,9 @@
 #include "config.h"
 #endif
 
+#undef VERSION
+#define VERSION "gentoo"
+
 #include "bdj.h"
 
 #include "native/register_native.h"