From 2c38147fe73cdca0f8e11387a7ee92b1506e99b9 Mon Sep 17 00:00:00 2001
From: Daniel Gröber <dxld@darkboxed.org>
Date: Sat, 26 Jan 2019 18:27:20 +0100
Subject: compile: v2-install --libs needs GHC >=8.0

---
 src/CabalHelper/Compiletime/Compile.hs     | 1 +
 src/CabalHelper/Compiletime/Program/GHC.hs | 1 +
 2 files changed, 2 insertions(+)

diff --git a/src/CabalHelper/Compiletime/Compile.hs b/src/CabalHelper/Compiletime/Compile.hs
index acdf7cc..3bc959c 100644
--- a/src/CabalHelper/Compiletime/Compile.hs
+++ b/src/CabalHelper/Compiletime/Compile.hs
@@ -216,6 +216,7 @@ compileHelper' CompHelperEnv {..} = do
        CabalInstallVersion instVer <- liftIO cabalInstallVersion
        guard $ instVer >= (Version [2,4,1,0] [])
        --  ^ didn't test with older versions
+       guard $ ghcVer  >= (GhcVersion (Version [8,0] []))
        env@(PackageEnvFile env_file)
            <- liftIO $ getPrivateCabalPkgEnv ghcVer cabalVer
        vLog $ logMsg ++ "v2-build package-env " ++ env_file
diff --git a/src/CabalHelper/Compiletime/Program/GHC.hs b/src/CabalHelper/Compiletime/Program/GHC.hs
index 79dd1b3..b58eab0 100644
--- a/src/CabalHelper/Compiletime/Program/GHC.hs
+++ b/src/CabalHelper/Compiletime/Program/GHC.hs
@@ -61,6 +61,7 @@ data GhcInvocation = GhcInvocation
     }
 
 newtype GhcVersion = GhcVersion { unGhcVersion :: Version }
+    deriving (Eq, Ord, Read, Show)
 
 showGhcVersion :: GhcVersion -> String
 showGhcVersion (GhcVersion v) = showVersion v
-- 
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