Remove X-Depends-Like from cabal file

..to relax Cabal dependency back to 1.18 (for ghc-7.8)

Setup.hs

@@ -30,12 +30,8 @@ main :: IO ()
 main = defaultMainWithHooks $ simpleUserHooks {
    instHook = inst,
    copyHook = copy,
-
+   buildHook = \pd lbi hooks flags -> (buildHook simpleUserHooks) pd (patchLibexecdir lbi) hooks flags,
-   confHook = \(gpd, hbi) cf ->
+   hookedPrograms = [ simpleProgram "shelltest" ]
-              xBuildDependsLike <$> (confHook simpleUserHooks) (gpd, hbi) cf
-
- , buildHook = \pd lbi hooks flags -> (buildHook simpleUserHooks) pd (patchLibexecdir lbi) hooks flags
- , hookedPrograms = [ simpleProgram "shelltest" ]
  }
 
 patchLibexecdir :: LocalBuildInfo -> LocalBuildInfo
@@ -46,49 +42,6 @@ patchLibexecdir lbi = let
   in
     lbi'
 
-
-xBuildDependsLike :: LocalBuildInfo -> LocalBuildInfo
-xBuildDependsLike lbi =
-  let
-      cc = componentsConfigs lbi
-      pd = localPkgDescr lbi
-      deps = dependsMap lbi
-  in lbi {
-          componentsConfigs =
-              [ (cn, updateClbi deps comp clbi, cdeps)
-              | (cn, clbi, cdeps) <- cc
-              , let comp = getComponent pd cn
-              ]
-         }
- where
-   updateClbi deps comp clbi = setUnionDeps (otherDeps deps comp) clbi
-
---   dependsMap ::
---    LocalBuildInfo -> [(ComponentName, ([(UnitId, PackageId)], Map PackageName ModuleRenaming))]
-   dependsMap lbi =
-       second (componentPackageDeps &&& componentPackageRenaming)
-           <$> allComponentsInBuildOrder lbi
-
---   otherDeps :: [(ComponentName, ([(UnitId, PackageId)], Map PackageName ModuleRenaming))] -> Component -> ([(UnitId, PackageId)], Map PackageName ModuleRenaming)
-   otherDeps deps comp = fromMaybe ([], M.empty) $
-       flip lookup deps =<< read <$> lookup "x-build-depends-like" fields
-      where
-        fields = customFieldsBI (componentBuildInfo comp)
-
-   setComponentPackageRenaming clbi cprn =
-     clbi { componentPackageRenaming =
-                componentPackageRenaming clbi `M.union` cprn }
-
---   setUnionDeps :: ([(UnitId, PackageId)], Map PackageName ModuleRenaming) -> ComponentLocalBuildInfo -> ComponentLocalBuildInfo
-   setUnionDeps (deps, rns) clbi = let
-      clbi' = setComponentPackageRenaming clbi rns
-      cpdeps = componentPackageDeps clbi
-    in
-      clbi' {
-          componentPackageDeps = cpdeps `union` deps
-      }
-
-
 -- mostly copypasta from 'defaultInstallHook'
 inst ::
     PackageDescription -> LocalBuildInfo -> UserHooks -> InstallFlags -> IO ()

ghc-mod.cabal

@@ -25,7 +25,7 @@ Description:
   For more information, please see its home page.
 
 Category:               GHC, Development
-Cabal-Version:          >= 1.24
+Cabal-Version:          >= 1.18
 Build-Type:             Custom
 Data-Files:             elisp/Makefile
                         elisp/*.el
@@ -95,7 +95,7 @@ Extra-Source-Files:     ChangeLog
 
 Custom-Setup
   Setup-Depends:         base
-                       , Cabal >= 1.24 && < 1.25
+                       , Cabal >= 1.18 && < 1.25
                        , containers
                        , filepath
                        , directory
@@ -302,7 +302,49 @@ Test-Suite spec
                         TargetSpec
 
   Build-Depends:        hspec             < 2.4  && >= 2.0.0
-  X-Build-Depends-Like: CLibName
+  Build-Depends:
+                        base              < 5    && >= 4.0
+                      , bytestring        < 0.11
+                      , binary            < 0.9  && >= 0.5.1.0
+                      , containers        < 0.6
+                      , cabal-helper      < 0.8  && >= 0.7.1.0
+                      , deepseq           < 1.5
+                      , directory         < 1.4
+                      , filepath          < 1.5
+                      , ghc               < 8.2  && >= 7.6
+                      , ghc-paths         < 0.2  && >= 0.1.0.9
+                      , ghc-syb-utils     < 0.3  && >= 0.2.3
+                      , hlint             < 1.10 && >= 1.9.27
+                      , monad-journal     < 0.8  && >= 0.4
+                      , old-time          < 1.2
+                      , process           < 1.5
+                      , syb               < 0.7  && >= 0.5.1
+                      , temporary         < 1.3  && >= 1.2.0.3
+                      , transformers      < 0.6
+                      , time              < 1.7
+                      , transformers-base < 0.5  && >= 0.4.4
+                      , mtl               < 2.3  && >= 2.0
+                      , monad-control     < 1.1  && >= 1
+                      , split             < 0.3  && >= 0.2.2
+                      , haskell-src-exts  < 1.20 && >= 1.18
+                      , text              < 1.3  && >= 1.2.1.3
+                      , djinn-ghc         < 0.1  && >= 0.0.2.2
+                      , fclabels          < 2.1  && >= 2.0
+                      , extra             < 1.6  && >= 1.4
+                      , pipes             < 4.4  && >= 4.1
+                      , safe              < 0.4  && >= 0.3.9
+                      , optparse-applicative <0.14.0 && >=0.13.0
+                      , template-haskell
+
+  if impl(ghc < 7.8)
+    Build-Depends:      convertible       < 1.2  && >= 1.1.0.0
+  if impl(ghc >= 8.0)
+    Build-Depends:      ghc-boot
+
+  Build-Depends:
+                        cabal-helper         < 0.8  && >= 0.7.1.0
+                      , ghc                  < 8.2  && >= 7.6
+                      , ghc-mod
 
 
 Test-Suite shelltest