4 files changed, 5 insertions, 1 deletions
diff --git a/compiler/nativeGen/RegAlloc/Linear/FreeRegs.hs b/compiler/nativeGen/RegAlloc/Linear/FreeRegs.hs
index 0247c9dfae..a1a00ba582 100644
--- a/compiler/nativeGen/RegAlloc/Linear/FreeRegs.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/FreeRegs.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 
 module RegAlloc.Linear.FreeRegs (
     FR(..),
diff --git a/compiler/nativeGen/RegAlloc/Linear/Main.hs b/compiler/nativeGen/RegAlloc/Linear/Main.hs
index 46d5309f70..ee43d25aa3 100644
--- a/compiler/nativeGen/RegAlloc/Linear/Main.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/Main.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE CPP, ScopedTypeVariables #-}
+
 -----------------------------------------------------------------------------
 --
 -- The register allocator
diff --git a/compiler/nativeGen/RegAlloc/Linear/PPC/FreeRegs.hs b/compiler/nativeGen/RegAlloc/Linear/PPC/FreeRegs.hs
index 0bdb49fb2e..b76fe79d7d 100644
--- a/compiler/nativeGen/RegAlloc/Linear/PPC/FreeRegs.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/PPC/FreeRegs.hs
@@ -1,4 +1,3 @@
-
 -- | Free regs map for PowerPC
 module RegAlloc.Linear.PPC.FreeRegs
 where
diff --git a/compiler/nativeGen/RegAlloc/Linear/State.hs b/compiler/nativeGen/RegAlloc/Linear/State.hs
index dc499c9c1f..39b5777ef3 100644
--- a/compiler/nativeGen/RegAlloc/Linear/State.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/State.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE UnboxedTuples #-}
+
 -- | State monad for the linear register allocator.
 
 --      Here we keep all the state that the register allocator keeps track