diff --git a/cabal-toolkit.cabal b/cabal-toolkit.cabal
--- a/cabal-toolkit.cabal
+++ b/cabal-toolkit.cabal
@@ -1,13 +1,13 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.31.2.
+-- This file has been generated from package.yaml by hpack version 0.32.0.
 --
 -- see: https://github.com/sol/hpack
 --
 -- hash: be37100e6056d538252283dbc42b9c84b77966bc48f0fa7f87c0295a91b2b3a9
 
 name:           cabal-toolkit
-version:        0.0.6
+version:        0.0.7
 synopsis:       Helper functions for writing custom Setup.hs scripts.
 description:    Helper functions for writing custom Setup.hs scripts.
                 .
diff --git a/src/Distribution/Simple/Toolkit.hs b/src/Distribution/Simple/Toolkit.hs
--- a/src/Distribution/Simple/Toolkit.hs
+++ b/src/Distribution/Simple/Toolkit.hs
@@ -41,7 +41,9 @@
 import Data.Binary
 import qualified Data.ByteString.Lazy as LBS
 import qualified Data.ByteString.Unsafe as BS
-import Data.Map
+import qualified Data.Map as Map
+import Data.List (intercalate)
+import Distribution.Text
 import Distribution.Simple
 import Distribution.Simple.LocalBuildInfo
 import Distribution.Simple.Program
@@ -109,7 +111,7 @@
 
 #if !MIN_VERSION_Cabal(2,0,0)
 -- | As defined in @Cabal-2.0.0.2@. See 'Distribution.Simple.InstallDirs.absoluteInstallDirs'.
-absoluteComponentInstallDirs 
+absoluteComponentInstallDirs
   :: PackageDescription -> LocalBuildInfo
   -> UnitId
   -> CopyDest
@@ -124,6 +126,23 @@
   (installDirTemplates lbi)
 #endif
 
+#if MIN_VERSION_Cabal(3,0,0)
+-- getComponentLocalBuildInfo was removed in Cabal 3.
+-- We simply define our own variant with the same flaws here,
+-- but in terms of Cabal 3 definitions.
+getComponentLocalBuildInfo :: LocalBuildInfo -> ComponentName -> ComponentLocalBuildInfo
+getComponentLocalBuildInfo lbi cname =
+    case Map.lookup cname (componentNameMap lbi) of
+      Just [clbi] -> clbi
+      Just clbis  ->
+          error $ "internal error: the component name " ++ show cname
+               ++ "is ambiguous.  Refers to: "
+               ++ intercalate ", " (fmap (display . componentUnitId) clbis)
+      Nothing ->
+          error $ "internal error: there is no configuration data "
+               ++ "for component " ++ show cname
+#endif
+
 {-|
 Retrieve the 'InstallDirs' corresponding to a 'ComponentName', assuming that component does exist and is unique.
 -}
@@ -150,7 +169,7 @@
 Equivalent to what you get from @ghc --print-libdir@.
 -}
 getGHCLibDir :: LocalBuildInfo -> FilePath
-getGHCLibDir lbi = compilerProperties (compiler lbi) ! "LibDir"
+getGHCLibDir lbi = compilerProperties (compiler lbi) Map.! "LibDir"
 
 {-|
 Run a 'Program' with default 'Verbosity'.
@@ -175,7 +194,7 @@
 
 #if MIN_VERSION_Cabal(2,0,0)
 {-|
-Extract 'PackageDBFlag's from 'LocalBuildInfo' to put into the 'packageDBFlags' field of 'DynFlags'. 
+Extract 'PackageDBFlag's from 'LocalBuildInfo' to put into the 'packageDBFlags' field of 'DynFlags'.
 This is useful to ensure the invocation of GHC API shares the same package databases (e.g. a @stack@ snapshot)
 -}
 getGHCPackageDBFlags :: LocalBuildInfo -> [PackageDBFlag]
@@ -198,7 +217,7 @@
 -- ghc-8.0.2/Cabal-1.24 has a similar mechanism around 'extraPkgConfs' which was superseded
 -- by 'packageDBFlags'.
 {-|
-Extract 'PkgConfRef's from 'LocalBuildInfo' to be prepended to the 'extraPkgConfs' field of 'DynFlags'. 
+Extract 'PkgConfRef's from 'LocalBuildInfo' to be prepended to the 'extraPkgConfs' field of 'DynFlags'.
 This is useful to ensure the invocation of GHC API shares the same package databases (e.g. a @stack@ snapshot)
 -}
 getGHCPackageDBFlags :: LocalBuildInfo -> [PkgConfRef]