+libraries/binary_dist-install_EXTRA_HC_OPTS += -fno-warn-unused-imports -fno-warn-identities
+
+# Temporarily turn off -Werror for some Hoopl modules that have
+# non-exhaustive pattern-match warnings
+libraries/hoopl/src/Compiler/Hoopl/Util_HC_OPTS += -Wwarn
+libraries/hoopl/src/Compiler/Hoopl/GraphUtil_HC_OPTS += -Wwarn
+libraries/hoopl/src/Compiler/Hoopl/MkGraph_HC_OPTS += -Wwarn
+libraries/hoopl/src/Compiler/Hoopl/XUtil_HC_OPTS += -Wwarn
+libraries/hoopl/src/Compiler/Hoopl/Pointed_HC_OPTS += -Wwarn
+libraries/hoopl/src/Compiler/Hoopl/Passes/Dominator_HC_OPTS += -Wwarn
+
+# primitive has a warning about deprecated use of GHC.IOBase
+libraries/primitive_dist-install_EXTRA_HC_OPTS += -Wwarn
+
+# vector has some unused match warnings
+libraries/vector_dist-install_EXTRA_HC_OPTS += -Wwarn
+
+libraries/dph/dph-base_dist-install_EXTRA_HC_OPTS += -Wwarn
+libraries/dph/dph-prim-interface_dist-install_EXTRA_HC_OPTS += -Wwarn
+libraries/dph/dph-prim-seq_dist-install_EXTRA_HC_OPTS += -Wwarn
+libraries/dph/dph-prim-par_dist-install_EXTRA_HC_OPTS += -Wwarn
+libraries/dph/dph-seq_dist-install_EXTRA_HC_OPTS += -Wwarn
+libraries/dph/dph-par_dist-install_EXTRA_HC_OPTS += -Wwarn
+
+# We need -fno-warn-deprecated-flags to avoid failure with -Werror
+GhcLibHcOpts += -fno-warn-deprecated-flags
+GhcBootLibHcOpts += -fno-warn-deprecated-flags
+