From 83f1e8ab1660418562c68a12e08d8337b97f378e Mon Sep 17 00:00:00 2001
From: Joshua Simmons <joshua.simmons@emptypath.com>
Date: Tue, 15 Aug 2017 23:46:58 -0700
Subject: [PATCH] add some help for a confusing error when you have no LICENSE
 file

fixes #2500
---
 src/Stack/Types/Build.hs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Stack/Types/Build.hs b/src/Stack/Types/Build.hs
index 4384a6cb05..9e73b9557c 100644
--- a/src/Stack/Types/Build.hs
+++ b/src/Stack/Types/Build.hs
@@ -333,6 +333,7 @@ missingExeError isSimpleBuildType msg =
   where
     possibleCauses =
         "No module named \"Main\". The 'main-is' source file should usually have a header indicating that it's a 'Main' module." :
+        "A cabal file that refers to nonexistent other files (e.g. a license-file that doesn't exist). Running 'cabal check' may point out these issues." :
         if isSimpleBuildType
             then []
             else ["The Setup.hs file is changing the installation target dir."]