I am using a recent install of Haskell platform (GHC/GHCi version 7.8.3) in OS X 10.9.5, and have been working through Real World Haskell and last year's CIS194 lectures and exercises. I attempted to follow the instructions for installing lambdabot (as given by https://wiki.haskell.org/Lambdabot ) via cabal install lambdabot. After 24 1/2 minutes, the process ended with a little over a dozen error messages apparently tracing to two occurrences of ExitFailure 1: MonadRandom-0.3.0.1 failed during the building phase. The exception was: ExitFailure 1 regex-pcre-0.94.4 failed during the building phase. The exception was: ExitFailure 1 ​The remaining messages were from components dependent on one or the other of those two. The logged failure for regex-pcre-0.94.4 ​included the following: Preprocessing library regex-pcre-0.94.4... Wrap.hsc:148:10: fatal error: 'pcre.h' file not found #include ^ 1 error generated. compiling dist/build/Text/Regex/PCRE/Wrap_hsc_make.c failed (exit code 1) ​and for MonadRandom-0.3.0.1 included: Preprocessing library MonadRandom-0.3.0.1... [1 of 2] Compiling Control.Monad.Random.Class ( Control/Monad/Random/Class.hs, dist/build/Control/Monad/Random/Class.o ) [2 of 2] Compiling Control.Monad.Random ( Control/Monad/Random.hs, dist/build/Control/Monad/Random.o ) [1 of 2] Compiling Control.Monad.Random.Class ( Control/Monad/Random/Class.hs, dist/build/Control/Monad/Random/Class.p_o ) [2 of 2] Compiling Control.Monad.Random ( Control/Monad/Random.hs, dist/build/Control/Monad/Random.p_o ) /Users/joel/.ghc/x86_64-darwin-7.8.3/package.conf.d/package.cache: openBinaryFile: does not exist (No such file or directory) ​ ​I am at a loss for corrective actions. I would assume that I need to locate the pcre.h header file and put it in the "right place"​, but was unable to find the location of Wrap_hsc_make.c. And I don't know how to address the non-existence of openBinaryFile in package.cache. Thanks in advance for any advice on correcting the above problems! -jn- -- Beauty of style and harmony and grace and good rhythm depend on simplicity. - Plato