Fix the build with GHC 6.4

[ghc-hetmet.git] / compiler / Makefile

diff --git a/compiler/Makefile b/compiler/Makefile
index 5cce4bc..ce69bae 100644 (file)
--- a/compiler/Makefile
+++ b/compiler/Makefile
@@ -685,6 +685,10 @@ parser/Lexer_HC_OPTS += -funbox-strict-fields
 # prototype via a global option instead of a myriad of per-file OPTIONS
 SRC_HC_OPTS += '-\#include "cutils.h"'
 
+ifeq "$(ghc_ge_605)" "NO"
+utils/LazyUniqFM_HC_OPTS += -fallow-undecidable-instances
+endif
+
 # ----------------------------------------------------------------------------
 #              Generate supporting stuff for prelude/PrimOp.lhs 
 #              from prelude/primops.txt