So I'm having a go of installing ghc-7.0.2 and haskell-platform-2011.2.0.0 on OSX 10.5. Since 10.5 is no longer supported I've had to compile from source. The good news is, so far as I can tell, everything works right out of the box.[1] But I've noticed when compiling the base libraries and HP a lot of warnings like the following: SpecConstr Function `a_s2Qn{v} [lid]' has three call patterns, but the limit is 1 Use -fspec-constr-count=n to set the bound Use -dppr-debug to see specialisations Though the number of call patterns and the limit vary. Googling led me to the SpecConstr file which I read briefly, so I know it has to do with optimizing away constructor allocations, but that's about it. Are these warnings I should be concerned about? [1] OSX 10.5.8 arch x86_64 (though it calls itself i386) Xcode 3.1.2 (not that it matters) gcc 4.0.1 (i686-apple-darwin9-gcc-4.0.1 Apple Inc. build 5490) ghc 6.12.1 / hp 2010.1.0.0 -- Live well, ~wren