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-rw-r--r--mk/build.mk.sample3
1 files changed, 2 insertions, 1 deletions
diff --git a/mk/build.mk.sample b/mk/build.mk.sample
index eed749cbb2..6266219f32 100644
--- a/mk/build.mk.sample
+++ b/mk/build.mk.sample
@@ -27,7 +27,8 @@
# Even faster build. NOT RECOMMENDED: the libraries will be
# completely unoptimised, so any code built with this compiler
-# (including stage2) will run very slowly:
+# (including stage2) will run very slowly, and many GHC tests
+# will fail with this profile (see Trac #12141):
#BuildFlavour = quickest
# Profile the stage2 compiler: