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diff --git a/src/CabalHelper/Runtime/Compat.hs b/src/CabalHelper/Runtime/Compat.hs
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+++ b/src/CabalHelper/Runtime/Compat.hs
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+-- cabal-helper: Simple interface to Cabal's configuration state
+-- Copyright (C) 2015-2018  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/>.
+
+{-# LANGUAGE CPP, BangPatterns, RecordWildCards, RankNTypes, ViewPatterns,
+  TupleSections #-}
+
+#ifdef MIN_VERSION_Cabal
+#undef CH_MIN_VERSION_Cabal
+#define CH_MIN_VERSION_Cabal MIN_VERSION_Cabal
+#endif
+
+module CabalHelper.Runtime.Compat
+    ( UnitId
+    , componentNameToCh
+    , unUnqualComponentName'
+    , componentNameFromComponent
+    , componentOutDir
+    ) where
+
+import System.FilePath
+
+import Distribution.PackageDescription
+  ( PackageDescription
+  , GenericPackageDescription(..)
+  , Flag(..)
+  , FlagName
+  , FlagAssignment
+  , Executable(..)
+  , Library(..)
+  , TestSuite(..)
+  , Benchmark(..)
+  , BuildInfo(..)
+  , TestSuiteInterface(..)
+  , BenchmarkInterface(..)
+  , withLib
+  )
+import Distribution.Simple.LocalBuildInfo
+  ( ComponentName(..)
+  , Component(..)
+  , LocalBuildInfo(..)
+  )
+
+
+#if CH_MIN_VERSION_Cabal(1,24,0)
+import Distribution.Package (UnitId)
+#else
+import Distribution.Package (InstalledPackageId)
+#endif
+
+#if CH_MIN_VERSION_Cabal(1,25,0)
+-- >=1.25
+import Distribution.PackageDescription
+  ( unFlagName
+  -- , mkFlagName
+  )
+import Distribution.Types.ForeignLib
+  ( ForeignLib(..)
+  )
+import Distribution.Types.UnqualComponentName
+  ( UnqualComponentName
+  , unUnqualComponentName
+  )
+#else
+-- <1.25
+import Distribution.PackageDescription
+  ( FlagName(FlagName)
+  )
+#endif
+
+#if CH_MIN_VERSION_Cabal(2,0,0)
+-- CPP >= 2.0
+import Distribution.Simple.LocalBuildInfo
+  ( allLibModules
+  , componentBuildDir
+  )
+import Distribution.Simple.Register
+  ( internalPackageDBPath
+  )
+import Distribution.Backpack
+  ( OpenUnitId(..),
+    OpenModule(..)
+  )
+import Distribution.ModuleName
+  ( ModuleName
+  )
+import Distribution.Types.ComponentId
+  ( unComponentId
+  )
+import Distribution.Types.ComponentLocalBuildInfo
+  ( maybeComponentInstantiatedWith
+  )
+import Distribution.Types.ModuleRenaming
+  ( ModuleRenaming(..),
+    isDefaultRenaming
+  )
+import Distribution.Types.MungedPackageId
+  ( MungedPackageId
+  )
+import Distribution.Types.UnitId
+  ( UnitId
+  , unDefUnitId
+  , unUnitId
+  )
+import Distribution.Types.UnitId
+  ( DefUnitId
+  )
+import Distribution.Utils.NubList
+  ( toNubListR
+  )
+import Distribution.Version
+  ( versionNumbers
+  , mkVersion
+  )
+import qualified Distribution.InstalledPackageInfo as Installed
+#endif
+
+#if CH_MIN_VERSION_Cabal(2,2,0)
+import Distribution.Types.GenericPackageDescription
+  ( unFlagAssignment
+  )
+#endif
+
+
+import CabalHelper.Shared.Sandbox
+import CabalHelper.Shared.Common
+import CabalHelper.Shared.InterfaceTypes
+
+
+
+
+
+
+
+#if !CH_MIN_VERSION_Cabal(1,24,0)
+type UnitId = InstalledPackageId
+#endif
+
+
+
+componentNameToCh :: a -> ComponentName -> ChComponentName
+componentNameToCh _ CLibName = ChLibName
+#if CH_MIN_VERSION_Cabal(2,0,0)
+componentNameToCh _ (CSubLibName n) = ChSubLibName (unUnqualComponentName' n)
+componentNameToCh _ (CFLibName n) = ChFLibName (unUnqualComponentName' n)
+#endif
+componentNameToCh _ (CExeName n) = ChExeName (unUnqualComponentName' n)
+componentNameToCh _ (CTestName n) = ChTestName (unUnqualComponentName' n)
+componentNameToCh _ (CBenchName n) = ChBenchName (unUnqualComponentName' n)
+
+
+#if CH_MIN_VERSION_Cabal(1,25,0)
+-- CPP >= 1.25
+unUnqualComponentName' :: UnqualComponentName -> String
+unUnqualComponentName' = unUnqualComponentName
+#else
+unUnqualComponentName' :: a -> a
+unUnqualComponentName' = id
+#endif
+
+
+componentNameFromComponent :: Component -> ComponentName
+#if !CH_MIN_VERSION_Cabal(1,25,0)
+-- CPP < 1.25
+componentNameFromComponent (CLib Library {}) = CLibName
+#elif CH_MIN_VERSION_Cabal(1,25,0)
+-- CPP >= 1.25 (redundant)
+componentNameFromComponent (CLib Library { libName = Nothing }) = CLibName
+componentNameFromComponent (CLib Library { libName = Just n })  = CSubLibName n
+componentNameFromComponent (CFLib ForeignLib {..}) = CFLibName foreignLibName
+#endif
+componentNameFromComponent (CExe Executable {..}) = CExeName exeName
+componentNameFromComponent (CTest TestSuite {..}) = CTestName testName
+componentNameFromComponent (CBench Benchmark {..}) = CBenchName benchmarkName
+
+
+componentOutDir :: LocalBuildInfo -> Component -> FilePath
+componentOutDir lbi (CLib Library {..})=
+    buildDir lbi
+#if CH_MIN_VERSION_Cabal(2,0,0)
+componentOutDir lbi (CFLib ForeignLib {..}) =
+    componentOutDir' lbi (unUnqualComponentName foreignLibName)
+#endif
+componentOutDir lbi (CExe Executable {..}) =
+    componentOutDir' lbi (unUnqualComponentName' exeName)
+componentOutDir lbi (CTest TestSuite { testInterface = TestSuiteLibV09 _ _, ..}) =
+    componentOutDir' lbi (unUnqualComponentName' testName ++ "Stub")
+componentOutDir lbi (CTest TestSuite { testInterface = _, ..}) =
+    componentOutDir' lbi (unUnqualComponentName' testName)
+componentOutDir lbi (CBench Benchmark { benchmarkInterface = _, ..})=
+    componentOutDir' lbi (unUnqualComponentName' benchmarkName)
+
+componentOutDir' :: LocalBuildInfo -> String -> FilePath
+componentOutDir' lbi compName' =
+  ----- Copied from Distribution/Simple/GHC.hs:buildOrReplExe
+  let targetDir = (buildDir lbi) </> compName'
+      compDir    = targetDir </> (compName' ++ "-tmp")
+  in compDir