1 files changed, 1 insertions, 1 deletions
diff --git a/makefile b/makefile
index 4388627..9b0cfea 100644
--- a/makefile
+++ b/makefile
@@ -18,7 +18,7 @@ distclean:
 
 
 testprog:
-	ghc --make test.hs -o ${OUTPUTDIR}/test
+	ghc -XDeriveDataTypeable --make test.hs -o ${OUTPUTDIR}/test
 
 fractranprog:
 	ghc --make fractran.hs -o ${OUTPUTDIR}/fractran