I installed ghc 4.08.2 binaries for sparc solaris (and those for intel linux, too), then tried compiling a sample program (the fibonacci one in the user guide) with ghc -parallel. The compiler complained: Could not find interface file for `Prelude' in the directories ./*.hi /u/trebla/lib/ghc-4.08.2/imports/lang/*.mp_hi /u/trebla/lib/ghc-4.08.2/imports/concurrent/*.mp_hi /u/trebla/lib/ghc-4.08.2/imports/lang/*.mp_hi /u/trebla/lib/ghc-4.08.2/imports/concurrent/*.mp_hi /u/trebla/lib/ghc-4.08.2/imports/std/*.mp_hi (and similarly for Parallel.) Does it mean I must build ghc myself from source? The user guide promises a lot of binary bundles such as par. Ever since 4.0x, the ghc download page ceases to mention them. Where are they?