ghc error

I tried compiling a file today using -O2, and it gave me this: /tmp/ghc10376_0/ghc10376_0.hc:5:20: HsTime.h: No such file or directory It compiled fine without the -O2. Am I missing some files? Where can I find what I need to make this work again? Thanks, -- Chad Scherrer "Time flies like an arrow; fruit flies like a banana" -- Groucho Marx