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-rw-r--r--mk/config.mk.in5
1 files changed, 4 insertions, 1 deletions
diff --git a/mk/config.mk.in b/mk/config.mk.in
index f69ef61d35..1f5576f69b 100644
--- a/mk/config.mk.in
+++ b/mk/config.mk.in
@@ -606,7 +606,10 @@ GHC_INPLACE = $(FPTOOLS_TOP)/ghc/compiler/ghc-inplace
#-----------------------------------------------------------------------------
# C compiler
#
-#
+# NB. Don't override $(WhatGccIsCalled) using build.mk, re-configure using
+# the flag --with-gcc=<blah> instead. The reason is that the configure script
+# needs to know which gcc you're using in order to perform its tests.
+
HaveGcc = @HaveGcc@
UseGcc = YES
WhatGccIsCalled = @WhatGccIsCalled@