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From: hololeap <hololeap@protonmail.com>
Signed-off-by: hololeap <hololeap@protonmail.com>
Bug: https://github.com/gentoo-haskell/gentoo-haskell/issues/1231

doctest pulls in the out-of-scope packages if they are installed on the
system. The best workaround is to use migrate to cabal-doctest.

diff -urN vector-0.12.3.1/Setup.hs vector-0.12.3.1-r1/Setup.hs
--- vector-0.12.3.1/Setup.hs	2021-09-21 10:02:15.000000000 -0600
+++ vector-0.12.3.1-r1/Setup.hs	2022-03-22 22:12:57.107142731 -0600
@@ -1,3 +1,6 @@
-import Distribution.Simple
-main = defaultMain
+module Main (main) where
 
+import Distribution.Extra.Doctest ( defaultMainWithDoctests )
+
+main :: IO ()
+main = defaultMainWithDoctests "vector-doctest"
diff -urN vector-0.12.3.1/tests/doctests.hs vector-0.12.3.1-r1/tests/doctests.hs
--- vector-0.12.3.1/tests/doctests.hs	2021-09-21 10:02:15.000000000 -0600
+++ vector-0.12.3.1-r1/tests/doctests.hs	2022-03-22 22:14:54.557142788 -0600
@@ -1,4 +1,30 @@
 import Test.DocTest (doctest)
+import GHC.IO.Encoding (setLocaleEncoding)
+import System.Directory (getCurrentDirectory, makeAbsolute)
+import System.FilePath.Posix ((</>))
+import System.IO (utf8)
+import Build_doctests (pkgs)
 
 main :: IO ()
-main = doctest ["-Iinclude", "-Iinternal", "Data"]
+main = do
+    setLocaleEncoding utf8
+    pwd    <- getCurrentDirectory
+    prefix <- makeAbsolute pwd
+
+    let customFlags =
+            [ "-package-env=-"
+            , "-hide-all-packages"
+            , "-no-user-package-db"
+            , "-package-db=" ++ prefix </> "dist/package.conf.inplace"
+            ]
+
+    let origFlags =
+            [ "-Iinclude"
+            , "-Iinternal"
+            ]
+
+    let modules =
+            [ "Data"
+            ]
+
+    doctest $ customFlags ++ pkgs ++ origFlags ++ modules
diff -urN vector-0.12.3.1/vector.cabal vector-0.12.3.1-r1/vector.cabal
--- vector-0.12.3.1/vector.cabal	2022-03-22 22:09:55.787142644 -0600
+++ vector-0.12.3.1-r1/vector.cabal	2022-03-22 22:12:23.547142715 -0600
@@ -49,7 +49,7 @@
 
 
 Cabal-Version:  >=1.10
-Build-Type:     Simple
+Build-Type:     Custom
 
 Extra-Source-Files:
       changelog.md
@@ -99,6 +99,11 @@
   Default: False
   Manual: True
 
+custom-setup
+  setup-depends:
+      base
+    , Cabal
+    , cabal-doctest
 
 Library
   Default-Language: Haskell2010
@@ -288,4 +293,6 @@
         base      -any
       , doctest   >=0.15 && <0.19
       , primitive >= 0.6.4.0 && < 0.8
-      , vector    -any
+      , directory
+      , filepath
+      , base-compat