[tests] Fix out of tree build. (#4657)

diff --git a/mono/tests/testing_gac/Makefile.am b/mono/tests/testing_gac/Makefile.am
index 3f4668b0f15b7805274f1abc36dab7442dd41913..d65b359ce5d46194ebf72adb7eb5163027245362 100644 (file)
--- a/mono/tests/testing_gac/Makefile.am
+++ b/mono/tests/testing_gac/Makefile.am
@@ -78,7 +78,7 @@ APP_SIGNED_V1_AOT=$(APP_SIGNED_V1_EXE:.exe=.exe$(PLATFORM_AOT_SUFFIX))
 endif
 
 
-SIGNING_KEY= testkey.snk
+SIGNING_KEY= $(srcdir)/testkey.snk
 
 # prefix for the testing gac.  gacutil will add lib/mono/gac directories
 GACDIR=.