diff --git a/cabal-install/Distribution/Client/Config.hs b/cabal-install/Distribution/Client/Config.hs
index 1c66e8d622f1692fa8cbc24c5ed659f9aa6252e5..6c2bfac1d5f5f032c90295644b49f33db26e32e2 100644
--- a/cabal-install/Distribution/Client/Config.hs
+++ b/cabal-install/Distribution/Client/Config.hs
@@ -48,8 +48,6 @@ import Distribution.Client.Types
( RemoteRepo(..), Username(..), Password(..), emptyRemoteRepo )
import Distribution.Client.BuildReports.Types
( ReportLevel(..) )
-import Distribution.Client.Dependency.Types
- ( ConstraintSource(..) )
import Distribution.Client.Setup
( GlobalFlags(..), globalCommand, defaultGlobalFlags
, ConfigExFlags(..), configureExOptions, defaultConfigExFlags
@@ -99,6 +97,8 @@ import Distribution.Compiler
import Distribution.Verbosity
( Verbosity, normal )
+import Distribution.Solver.Types.ConstraintSource
+
import Data.List
( partition, find, foldl' )
import Data.Maybe
diff --git a/cabal-install/Distribution/Client/Configure.hs b/cabal-install/Distribution/Client/Configure.hs
index 31f90f737af1d8ed5a557610038277cc7a6fab55..243be2467700b5913be31b5951896eb7cbb83593 100644
--- a/cabal-install/Distribution/Client/Configure.hs
+++ b/cabal-install/Distribution/Client/Configure.hs
@@ -20,8 +20,7 @@ module Distribution.Client.Configure (
import Distribution.Client.Dependency
import Distribution.Client.Dependency.Types
- ( ConstraintSource(..)
- , LabeledPackageConstraint(..), showConstraintSource )
+ ( LabeledPackageConstraint(..) )
import qualified Distribution.Client.InstallPlan as InstallPlan
import Distribution.Client.InstallPlan (SolverInstallPlan)
import Distribution.Client.IndexUtils as IndexUtils
@@ -38,6 +37,7 @@ import Distribution.Package (PackageId)
import Distribution.Client.JobControl (Lock)
import qualified Distribution.Solver.Types.ComponentDeps as CD
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.OptionalStanza
import Distribution.Solver.Types.PackageIndex
( PackageIndex, elemByPackageName )
diff --git a/cabal-install/Distribution/Client/Dependency.hs b/cabal-install/Distribution/Client/Dependency.hs
index 18aa86d5042c27924ebbf91473d729a6ec13c79c..848595aa84ab07b34725484a68ed48f79516df6a 100644
--- a/cabal-install/Distribution/Client/Dependency.hs
+++ b/cabal-install/Distribution/Client/Dependency.hs
@@ -77,7 +77,6 @@ import Distribution.Client.Dependency.Types
( PreSolver(..), Solver(..), DependencyResolver, ResolverPackage(..)
, PackageConstraint(..), showPackageConstraint
, LabeledPackageConstraint(..), unlabelPackageConstraint
- , ConstraintSource(..), showConstraintSource
, PackagePreferences(..), InstalledPreference(..)
, PackagesPreferenceDefault(..) )
import Distribution.Client.Sandbox.Types
@@ -116,6 +115,7 @@ import Distribution.Verbosity
import Distribution.Solver.Types.ComponentDeps (ComponentDeps)
import qualified Distribution.Solver.Types.ComponentDeps as CD
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.OptionalStanza
import qualified Distribution.Solver.Types.PackageIndex as PackageIndex
import Distribution.Solver.Types.PkgConfigDb (PkgConfigDb)
diff --git a/cabal-install/Distribution/Client/Dependency/Types.hs b/cabal-install/Distribution/Client/Dependency/Types.hs
index 9d84997677e3ffe010d9fc0ae962741ab1bb308f..3588fb07609520d4d0a5ba259fafabaabf09a891 100644
--- a/cabal-install/Distribution/Client/Dependency/Types.hs
+++ b/cabal-install/Distribution/Client/Dependency/Types.hs
@@ -27,15 +27,14 @@ module Distribution.Client.Dependency.Types (
PackagesPreferenceDefault(..),
LabeledPackageConstraint(..),
- ConstraintSource(..),
- unlabelPackageConstraint,
- showConstraintSource
+ unlabelPackageConstraint
) where
import Data.Char
( isAlpha, toLower )
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.OptionalStanza
import Distribution.Solver.Types.PkgConfigDb ( PkgConfigDb )
import Distribution.Solver.Types.PackageIndex ( PackageIndex )
@@ -206,65 +205,3 @@ data LabeledPackageConstraint
unlabelPackageConstraint :: LabeledPackageConstraint -> PackageConstraint
unlabelPackageConstraint (LabeledPackageConstraint pc _) = pc
-
--- | Source of a 'PackageConstraint'.
-data ConstraintSource =
-
- -- | Main config file, which is ~/.cabal/config by default.
- ConstraintSourceMainConfig FilePath
-
- -- | Local cabal.project file
- | ConstraintSourceProjectConfig FilePath
-
- -- | Sandbox config file, which is ./cabal.sandbox.config by default.
- | ConstraintSourceSandboxConfig FilePath
-
- -- | User config file, which is ./cabal.config by default.
- | ConstraintSourceUserConfig FilePath
-
- -- | Flag specified on the command line.
- | ConstraintSourceCommandlineFlag
-
- -- | Target specified by the user, e.g., @cabal install package-0.1.0.0@
- -- implies @package==0.1.0.0@.
- | ConstraintSourceUserTarget
-
- -- | Internal requirement to use installed versions of packages like ghc-prim.
- | ConstraintSourceNonUpgradeablePackage
-
- -- | Internal requirement to use the add-source version of a package when that
- -- version is installed and the source is modified.
- | ConstraintSourceModifiedAddSourceDep
-
- -- | Internal constraint used by @cabal freeze@.
- | ConstraintSourceFreeze
-
- -- | Constraint specified by a config file, a command line flag, or a user
- -- target, when a more specific source is not known.
- | ConstraintSourceConfigFlagOrTarget
-
- -- | The source of the constraint is not specified.
- | ConstraintSourceUnknown
- deriving (Eq, Show, Generic)
-
-instance Binary ConstraintSource
-
--- | Description of a 'ConstraintSource'.
-showConstraintSource :: ConstraintSource -> String
-showConstraintSource (ConstraintSourceMainConfig path) =
- "main config " ++ path
-showConstraintSource (ConstraintSourceProjectConfig path) =
- "project config " ++ path
-showConstraintSource (ConstraintSourceSandboxConfig path) =
- "sandbox config " ++ path
-showConstraintSource (ConstraintSourceUserConfig path)= "user config " ++ path
-showConstraintSource ConstraintSourceCommandlineFlag = "command line flag"
-showConstraintSource ConstraintSourceUserTarget = "user target"
-showConstraintSource ConstraintSourceNonUpgradeablePackage =
- "non-upgradeable package"
-showConstraintSource ConstraintSourceModifiedAddSourceDep =
- "modified add-source dependency"
-showConstraintSource ConstraintSourceFreeze = "cabal freeze"
-showConstraintSource ConstraintSourceConfigFlagOrTarget =
- "config file, command line flag, or user target"
-showConstraintSource ConstraintSourceUnknown = "unknown source"
diff --git a/cabal-install/Distribution/Client/Freeze.hs b/cabal-install/Distribution/Client/Freeze.hs
index bd63d325509349f0d79c3fbd878f57f264c2ee03..fb308aad654ac6de7c33858d02d768c4479779fb 100644
--- a/cabal-install/Distribution/Client/Freeze.hs
+++ b/cabal-install/Distribution/Client/Freeze.hs
@@ -21,7 +21,7 @@ import Distribution.Client.Types
import Distribution.Client.Targets
import Distribution.Client.Dependency
import Distribution.Client.Dependency.Types
- ( ConstraintSource(..), LabeledPackageConstraint(..) )
+ ( LabeledPackageConstraint(..) )
import Distribution.Client.IndexUtils as IndexUtils
( getSourcePackages, getInstalledPackages )
import Distribution.Client.InstallPlan
@@ -36,6 +36,7 @@ import Distribution.Client.Sandbox.PackageEnvironment
import Distribution.Client.Sandbox.Types
( SandboxPackageInfo(..) )
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.OptionalStanza
import Distribution.Solver.Types.PkgConfigDb
( PkgConfigDb, readPkgConfigDb )
diff --git a/cabal-install/Distribution/Client/Install.hs b/cabal-install/Distribution/Client/Install.hs
index 78e16961cea7d1e9e9f76b50b99d7d61215fcf6b..463c14f3152d8503a82995f18dace7e6ef72b58c 100644
--- a/cabal-install/Distribution/Client/Install.hs
+++ b/cabal-install/Distribution/Client/Install.hs
@@ -72,7 +72,7 @@ import Distribution.Client.Configure
( chooseCabalVersion, configureSetupScript, checkConfigExFlags )
import Distribution.Client.Dependency
import Distribution.Client.Dependency.Types
- ( Solver(..), ConstraintSource(..), LabeledPackageConstraint(..) )
+ ( Solver(..), LabeledPackageConstraint(..) )
import Distribution.Client.FetchUtils
import Distribution.Client.HttpUtils
( HttpTransport (..) )
@@ -110,6 +110,7 @@ import Distribution.Client.Compat.ExecutablePath
import Distribution.Client.JobControl
import qualified Distribution.Solver.Types.ComponentDeps as CD
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.OptionalStanza
import qualified Distribution.Solver.Types.PackageIndex as SourcePackageIndex
import Distribution.Solver.Types.PackageFixedDeps
diff --git a/cabal-install/Distribution/Client/ProjectConfig/Legacy.hs b/cabal-install/Distribution/Client/ProjectConfig/Legacy.hs
index 31b4f1888fe2a93e0a96ec070467c52b4149430c..60473e8c0b5ecadf05a262f78c1533f7ccb1c5ab 100644
--- a/cabal-install/Distribution/Client/ProjectConfig/Legacy.hs
+++ b/cabal-install/Distribution/Client/ProjectConfig/Legacy.hs
@@ -23,11 +23,11 @@ module Distribution.Client.ProjectConfig.Legacy (
import Distribution.Client.ProjectConfig.Types
import Distribution.Client.Types
( RemoteRepo(..), emptyRemoteRepo )
-import Distribution.Client.Dependency.Types
- ( ConstraintSource(..) )
import Distribution.Client.Config
( SavedConfig(..), remoteRepoFields )
+import Distribution.Solver.Types.ConstraintSource
+
import Distribution.Package
import Distribution.PackageDescription
( SourceRepo(..), RepoKind(..) )
diff --git a/cabal-install/Distribution/Client/ProjectConfig/Types.hs b/cabal-install/Distribution/Client/ProjectConfig/Types.hs
index 27bed0884c798facfc2ce223b61b844a28a517df..93c4c7aaddb7ee92243c4fcc6de1b63dfe684a5c 100644
--- a/cabal-install/Distribution/Client/ProjectConfig/Types.hs
+++ b/cabal-install/Distribution/Client/ProjectConfig/Types.hs
@@ -22,14 +22,14 @@ module Distribution.Client.ProjectConfig.Types (
import Distribution.Client.Types
( RemoteRepo )
import Distribution.Client.Dependency.Types
- ( PreSolver, ConstraintSource )
+ ( PreSolver )
import Distribution.Client.Targets
( UserConstraint )
import Distribution.Client.BuildReports.Types
( ReportLevel(..) )
import Distribution.Solver.Types.Settings
- ( ReorderGoals, StrongFlags )
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Package
( PackageName, PackageId, UnitId, Dependency )
diff --git a/cabal-install/Distribution/Client/ProjectPlanning.hs b/cabal-install/Distribution/Client/ProjectPlanning.hs
index d9a808a4a2b1047473f7061b3a3e562df94cef65..f396c0d68fd12faa689f52a769be2728819c0bb1 100644
--- a/cabal-install/Distribution/Client/ProjectPlanning.hs
+++ b/cabal-install/Distribution/Client/ProjectPlanning.hs
@@ -78,6 +78,7 @@ import Distribution.Utils.NubList
import qualified Distribution.Solver.Types.ComponentDeps as CD
import Distribution.Solver.Types.ComponentDeps (ComponentDeps)
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.OptionalStanza
import Distribution.Solver.Types.PackageFixedDeps
import qualified Distribution.Solver.Types.PackageIndex as SourcePackageIndex
diff --git a/cabal-install/Distribution/Client/Sandbox/PackageEnvironment.hs b/cabal-install/Distribution/Client/Sandbox/PackageEnvironment.hs
index 04c9632ae61526c340c236105f5884177b295303..18588bd372926fd06391e3a78624a260d6a13fe0 100644
--- a/cabal-install/Distribution/Client/Sandbox/PackageEnvironment.hs
+++ b/cabal-install/Distribution/Client/Sandbox/PackageEnvironment.hs
@@ -36,7 +36,6 @@ import Distribution.Client.Config ( SavedConfig(..), commentSavedConfig
, installDirsFields, withProgramsFields
, withProgramOptionsFields
, defaultCompiler )
-import Distribution.Client.Dependency.Types ( ConstraintSource (..) )
import Distribution.Client.ParseUtils ( parseFields, ppFields, ppSection )
import Distribution.Client.Setup ( GlobalFlags(..), ConfigExFlags(..)
, InstallFlags(..)
@@ -51,6 +50,7 @@ import Distribution.Simple.Setup ( Flag(..)
, ConfigFlags(..), HaddockFlags(..)
, fromFlagOrDefault, toFlag, flagToMaybe )
import Distribution.Simple.Utils ( die, info, notice, warn )
+import Distribution.Solver.Types.ConstraintSource
import Distribution.ParseUtils ( FieldDescr(..), ParseResult(..)
, commaListField, commaNewLineListField
, liftField, lineNo, locatedErrorMsg
diff --git a/cabal-install/Distribution/Client/Setup.hs b/cabal-install/Distribution/Client/Setup.hs
index bdf953d3ba2ba5af32568c6c9d8e4fced3ef14a2..edb3622780cd8e6c88efaecb18fac78da3d5387f 100644
--- a/cabal-install/Distribution/Client/Setup.hs
+++ b/cabal-install/Distribution/Client/Setup.hs
@@ -59,7 +59,7 @@ import Distribution.Client.Types
import Distribution.Client.BuildReports.Types
( ReportLevel(..) )
import Distribution.Client.Dependency.Types
- ( PreSolver(..), ConstraintSource(..) )
+ ( PreSolver(..) )
import qualified Distribution.Client.Init.Types as IT
( InitFlags(..), PackageType(..) )
import Distribution.Client.Targets
@@ -67,6 +67,7 @@ import Distribution.Client.Targets
import Distribution.Utils.NubList
( NubList, toNubList, fromNubList)
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.Settings
import Distribution.Simple.Compiler (PackageDB)
diff --git a/cabal-install/Distribution/Client/Targets.hs b/cabal-install/Distribution/Client/Targets.hs
index 6d796bb156a972be106835b43744c02a4a5195f9..82c53b39aa934926fe8c3eca6415ee97f8e85eb3 100644
--- a/cabal-install/Distribution/Client/Targets.hs
+++ b/cabal-install/Distribution/Client/Targets.hs
@@ -58,9 +58,10 @@ import Distribution.Client.Types
( PackageLocation(..)
, ResolvedPkgLoc, UnresolvedSourcePackage )
import Distribution.Client.Dependency.Types
- ( PackageConstraint(..), ConstraintSource(..)
+ ( PackageConstraint(..)
, LabeledPackageConstraint(..) )
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.OptionalStanza
import Distribution.Solver.Types.PackageIndex (PackageIndex)
import qualified Distribution.Solver.Types.PackageIndex as PackageIndex
diff --git a/cabal-install/Distribution/Solver/Modular/Message.hs b/cabal-install/Distribution/Solver/Modular/Message.hs
index 95208bf396053e985974f167d92572214e6311ed..5cefa26f6cd14b47143d53b31c3266a549c31cd7 100644
--- a/cabal-install/Distribution/Solver/Modular/Message.hs
+++ b/cabal-install/Distribution/Solver/Modular/Message.hs
@@ -15,9 +15,8 @@ import Distribution.Solver.Modular.Flag
import Distribution.Solver.Modular.Package
import Distribution.Solver.Modular.Tree
( FailReason(..), POption(..) )
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.Progress
-import Distribution.Client.Dependency.Types
- ( ConstraintSource(..), showConstraintSource )
data Message =
Enter -- ^ increase indentation level
diff --git a/cabal-install/Distribution/Solver/Modular/Preference.hs b/cabal-install/Distribution/Solver/Modular/Preference.hs
index fb9c3470ad1199ebe5bee99bddf22b19b462f4b5..1dc4a00142dd8f9a6b9244071f8c644c223e8561 100644
--- a/cabal-install/Distribution/Solver/Modular/Preference.hs
+++ b/cabal-install/Distribution/Solver/Modular/Preference.hs
@@ -29,8 +29,9 @@ import Data.Map (Map)
import Data.Traversable (sequence)
import Distribution.Client.Dependency.Types
- ( PackageConstraint(..), LabeledPackageConstraint(..), ConstraintSource(..)
+ ( PackageConstraint(..), LabeledPackageConstraint(..)
, PackagePreferences(..), InstalledPreference(..) )
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.OptionalStanza
import Distribution.Solver.Modular.Dependency
diff --git a/cabal-install/Distribution/Solver/Modular/Tree.hs b/cabal-install/Distribution/Solver/Modular/Tree.hs
index 58c794abb7c6bf7c6a54e99c3a2309ac240b5b7c..32908b0170438b9b8f2dbf78bc610c17cacf7d8d 100644
--- a/cabal-install/Distribution/Solver/Modular/Tree.hs
+++ b/cabal-install/Distribution/Solver/Modular/Tree.hs
@@ -26,7 +26,7 @@ import Distribution.Solver.Modular.Package
import Distribution.Solver.Modular.PSQ (PSQ)
import qualified Distribution.Solver.Modular.PSQ as P
import Distribution.Solver.Modular.Version
-import Distribution.Client.Dependency.Types ( ConstraintSource(..) )
+import Distribution.Solver.Types.ConstraintSource
-- | Type of the search tree. Inlining the choice nodes for now.
data Tree a =
diff --git a/cabal-install/Distribution/Solver/Types/ConstraintSource.hs b/cabal-install/Distribution/Solver/Types/ConstraintSource.hs
new file mode 100644
index 0000000000000000000000000000000000000000..4f378c70d02d1c3c3155dac7f57bffb8ecb09a81
--- /dev/null
+++ b/cabal-install/Distribution/Solver/Types/ConstraintSource.hs
@@ -0,0 +1,72 @@
+{-# LANGUAGE DeriveGeneric #-}
+module Distribution.Solver.Types.ConstraintSource
+ ( ConstraintSource(..)
+ , showConstraintSource
+ ) where
+
+import GHC.Generics (Generic)
+import Distribution.Compat.Binary (Binary(..))
+
+import Prelude hiding (fail)
+
+-- | Source of a 'PackageConstraint'.
+data ConstraintSource =
+
+ -- | Main config file, which is ~/.cabal/config by default.
+ ConstraintSourceMainConfig FilePath
+
+ -- | Local cabal.project file
+ | ConstraintSourceProjectConfig FilePath
+
+ -- | Sandbox config file, which is ./cabal.sandbox.config by default.
+ | ConstraintSourceSandboxConfig FilePath
+
+ -- | User config file, which is ./cabal.config by default.
+ | ConstraintSourceUserConfig FilePath
+
+ -- | Flag specified on the command line.
+ | ConstraintSourceCommandlineFlag
+
+ -- | Target specified by the user, e.g., @cabal install package-0.1.0.0@
+ -- implies @package==0.1.0.0@.
+ | ConstraintSourceUserTarget
+
+ -- | Internal requirement to use installed versions of packages like ghc-prim.
+ | ConstraintSourceNonUpgradeablePackage
+
+ -- | Internal requirement to use the add-source version of a package when that
+ -- version is installed and the source is modified.
+ | ConstraintSourceModifiedAddSourceDep
+
+ -- | Internal constraint used by @cabal freeze@.
+ | ConstraintSourceFreeze
+
+ -- | Constraint specified by a config file, a command line flag, or a user
+ -- target, when a more specific source is not known.
+ | ConstraintSourceConfigFlagOrTarget
+
+ -- | The source of the constraint is not specified.
+ | ConstraintSourceUnknown
+ deriving (Eq, Show, Generic)
+
+instance Binary ConstraintSource
+
+-- | Description of a 'ConstraintSource'.
+showConstraintSource :: ConstraintSource -> String
+showConstraintSource (ConstraintSourceMainConfig path) =
+ "main config " ++ path
+showConstraintSource (ConstraintSourceProjectConfig path) =
+ "project config " ++ path
+showConstraintSource (ConstraintSourceSandboxConfig path) =
+ "sandbox config " ++ path
+showConstraintSource (ConstraintSourceUserConfig path)= "user config " ++ path
+showConstraintSource ConstraintSourceCommandlineFlag = "command line flag"
+showConstraintSource ConstraintSourceUserTarget = "user target"
+showConstraintSource ConstraintSourceNonUpgradeablePackage =
+ "non-upgradeable package"
+showConstraintSource ConstraintSourceModifiedAddSourceDep =
+ "modified add-source dependency"
+showConstraintSource ConstraintSourceFreeze = "cabal freeze"
+showConstraintSource ConstraintSourceConfigFlagOrTarget =
+ "config file, command line flag, or user target"
+showConstraintSource ConstraintSourceUnknown = "unknown source"
diff --git a/cabal-install/cabal-install.cabal b/cabal-install/cabal-install.cabal
index 11a2451ee00d70ff5a6e491e580b7540c7315667..85664ec31e413dcecf2c24e7d3e5dbe629dd95b6 100644
--- a/cabal-install/cabal-install.cabal
+++ b/cabal-install/cabal-install.cabal
@@ -216,6 +216,7 @@ executable cabal
Distribution.Client.Compat.Process
Distribution.Client.Compat.Semaphore
Distribution.Solver.Types.ComponentDeps
+ Distribution.Solver.Types.ConstraintSource
Distribution.Solver.Types.Internal.Utils
Distribution.Solver.Types.OptionalStanza
Distribution.Solver.Types.PackageFixedDeps
diff --git a/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs b/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs
index 40e618cdd72f8fc1779ebbfcf4aa8448f513a076..5acb03ecd1ab528b197525a56ae7db8a27a824b2 100644
--- a/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs
+++ b/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs
@@ -31,6 +31,7 @@ import Distribution.Client.Targets
import Distribution.Utils.NubList
import Network.URI
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.OptionalStanza
import Distribution.Solver.Types.Settings
diff --git a/cabal-install/tests/UnitTests/Distribution/Solver/Modular/DSL.hs b/cabal-install/tests/UnitTests/Distribution/Solver/Modular/DSL.hs
index 7a8eb4c54102ae18f483f3f63982c2367b11fcb1..4c3be71d2c0edc0f0b3b9b7463c76db189d2811e 100644
--- a/cabal-install/tests/UnitTests/Distribution/Solver/Modular/DSL.hs
+++ b/cabal-install/tests/UnitTests/Distribution/Solver/Modular/DSL.hs
@@ -48,6 +48,7 @@ import qualified Distribution.Client.InstallPlan as CI.InstallPlan
import Distribution.Solver.Types.ComponentDeps (ComponentDeps)
import qualified Distribution.Solver.Types.ComponentDeps as CD
+import Distribution.Solver.Types.ConstraintSource
import Distribution.Solver.Types.OptionalStanza
import qualified Distribution.Solver.Types.PackageIndex as CI.PackageIndex
import qualified Distribution.Solver.Types.PkgConfigDb as PC