Currently we can specify the path to the compiler using: runhaskell Setup configure --with-compiler=... and there's another flag for --with-hc-pkg=... But now that the compilers are also using the Program abstraction they automatically get corresponding configure flags: --with-ghc=... --with-ghc-pkg=... --with-hugs=... --with-ffihugs=... --with-hmake=... etc etc (there are also --<prog>-args=... flags for each one) The difference is that these are specific to the program, for example --with-hc-pkg does not apply for most compilers. So in the code at the moment, on a per-compiler basis we have to take the --with-compiler= arg (if it was supplied) and use it to override what we got through the generic --with-<prog> mechanism. So do we need the generic --with-compiler= --with-hc-pkg= flags? If someone knows the path to a specific compiler then don't they already know the which compiler they're using and they could specify the specific arg instead? Duncan