Add integer-simple as a build option

ghc.mk

@@ -535,6 +535,16 @@ ifneq "$(findstring $(phase),0 1 2)" ""
 ghc_stage1_DISABLE = YES
 endif
 
+ifeq "$(INTEGER_LIBRARY)" "integer-gmp"
+libraries/base_dist-install_CONFIGURE_OPTS += --flags=-integer-simple
+else
+    ifeq "$(INTEGER_LIBRARY)" "integer-simple"
+	libraries/base_dist-install_CONFIGURE_OPTS += --flags=integer-simple
+    else
+	$(error Unknown integer library: $(INTEGER_LIBRARY))
+    endif
+endif
+
 ifneq "$(findstring $(phase),0 1 2 3)" ""
 # In phases 0-3, we disable stage2-3, the full libraries and haddock
 utils/haddock_dist_DISABLE = YES

packages

@@ -35,6 +35,7 @@ libraries/haskell98                     packages/haskell98              darcs
 libraries/hpc                           packages/hpc                    darcs
 libraries/integer                       packages/integer                darcs
 libraries/integer-gmp                   packages/integer-gmp            darcs
+libraries/integer-simple                packages/integer-simple         darcs
 libraries/mtl                           packages/mtl                    darcs
 libraries/old-locale                    packages/old-locale             darcs
 libraries/old-time                      packages/old-time               darcs