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diff --git a/src/CabalHelper/Compiletime/Process.hs b/src/CabalHelper/Compiletime/Process.hs
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+-- cabal-helper: Simple interface to Cabal's configuration state
+-- Copyright (C) 2018  Daniel Gröber <cabal-helper@dxld.at>
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+{-|
+Module      : CabalHelper.Compiletime.Process
+Description : System process utilities
+License     : GPL-3
+-}
+
+module CabalHelper.Compiletime.Process
+    ( module CabalHelper.Compiletime.Process
+    , module System.Process
+    ) where
+
+import Data.Char
+import Data.List
+import GHC.IO.Exception (IOErrorType(OtherError))
+import System.IO
+import System.IO.Error
+import System.Exit
+import System.Process
+
+import CabalHelper.Compiletime.Types
+import CabalHelper.Compiletime.Log
+
+readProcess' :: Verbose => FilePath -> [String] -> String -> IO String
+readProcess' exe args inp = do
+  vLog $ intercalate " " $ map formatProcessArg (exe:args)
+  outp <- readProcess exe args inp
+  vLog $ unlines $ map ("=> "++) $ lines outp
+  return outp
+
+
+callProcessStderr'
+    :: Verbose => Maybe FilePath -> FilePath -> [String] -> IO ExitCode
+callProcessStderr' mwd exe args = do
+  let cd = case mwd of
+             Nothing -> []; Just wd -> [ "cd", formatProcessArg wd++";" ]
+  vLog $ intercalate " " $ cd ++ map formatProcessArg (exe:args)
+  (_, _, _, h) <- createProcess (proc exe args) { std_out = UseHandle stderr
+                                                , cwd = mwd }
+  waitForProcess h
+
+callProcessStderr :: Verbose => Maybe FilePath -> FilePath -> [String] -> IO ()
+callProcessStderr mwd exe args = do
+  rv <- callProcessStderr' mwd exe args
+  case rv of
+    ExitSuccess -> return ()
+    ExitFailure v -> processFailedException "callProcessStderr" exe args v
+
+processFailedException :: String -> String -> [String] -> Int -> IO a
+processFailedException fn exe args rv =
+    ioError $ mkIOError OtherError msg Nothing Nothing
+  where
+    msg = concat [ fn, ": ", exe, " "
+                 , intercalate " " (map formatProcessArg args)
+                 , " (exit " ++ show rv ++ ")"
+                 ]
+
+formatProcessArg :: String -> String
+formatProcessArg xs
+    | any isSpace xs = "'"++ xs ++"'"
+    | otherwise      = xs