Fix `make roundtrip` on srcdir != builddir (#79)
diff --git a/Makefile.am b/Makefile.am
index 164136d..9585a15 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -72,7 +72,7 @@ CLEANFILES += LICENSE2
BZIP3 := bzip3$(EXEEXT)
roundtrip: $(BZIP3)
- rm -f LICENSE2
- ./$(BZIP3) -v -feb 6 LICENSE
- ./$(BZIP3) -v -d LICENSE.bz3 LICENSE2
- cmp LICENSE LICENSE2
+ rm -f $(builddir)/LICENSE2
+ ./$(BZIP3) -v -feb 6 $(srcdir)/LICENSE $(builddir)/LICENSE.bz3
+ ./$(BZIP3) -v -d $(builddir)/LICENSE.bz3 $(builddir)/LICENSE2
+ cmp $(srcdir)/LICENSE $(builddir)/LICENSE2
