diff -r 00809c43d72c -r 250d9cf97fb3 Makefile
--- a/Makefile	Wed Feb 04 12:26:16 2015 -0500
+++ b/Makefile	Wed Feb 04 15:17:13 2015 -0500
@@ -14,6 +14,7 @@
 DOCFILES=mercurial/help/*.txt
 export LANGUAGE=C
 export LC_ALL=C
+TESTFLAGS ?= $(shell echo $$HGTESTFLAGS)
 
 # Set this to e.g. "mingw32" to use a non-default compiler.
 COMPILER=