diff --git a/Cabal/Distribution/PackageDescription/Check.hs b/Cabal/Distribution/PackageDescription/Check.hs
index be4e94a2d217cca0dbb7c5c5e605c77faef2d41e..b1b32817b77059d214c53665536c5d791a169ecd 100644
--- a/Cabal/Distribution/PackageDescription/Check.hs
+++ b/Cabal/Distribution/PackageDescription/Check.hs
@@ -1379,30 +1379,36 @@ checkPackageContent :: Monad m => CheckPackageContentOps m
                     -> PackageDescription
                     -> m [PackageCheck]
 checkPackageContent ops pkg = do
-  licenseErrors   <- checkLicensesExist   ops pkg
   setupError      <- checkSetupExists     ops pkg
   configureError  <- checkConfigureExists ops pkg
   localPathErrors <- checkLocalPathsExist ops pkg
   vcsLocation     <- checkMissingVcsInfo  ops pkg
+  fileExistsError <- checkFilesExist      ops pkg
 
-  return $ licenseErrors
-        ++ catMaybes [setupError, configureError]
+  return $ 
+        catMaybes [setupError, configureError]
         ++ localPathErrors
         ++ vcsLocation
-
-checkLicensesExist :: Monad m => CheckPackageContentOps m
-                   -> PackageDescription
-                   -> m [PackageCheck]
-checkLicensesExist ops pkg = do
-    exists <- mapM (doesFileExist ops) (licenseFiles pkg)
-    return
-      [ PackageBuildWarning $
-           "The '" ++ fieldname ++ "' field refers to the file "
-        ++ quote file ++ " which does not exist."
-      | (file, False) <- zip (licenseFiles pkg) exists ]
-  where
-    fieldname | length (licenseFiles pkg) == 1 = "license-file"
-              | otherwise                      = "license-files"
+        ++ fileExistsError
+
+checkFilesExist :: Monad m => CheckPackageContentOps m
+                -> PackageDescription
+                -> m [PackageCheck]
+checkFilesExist ops pkg = do
+  let filess = [ (files, kind)
+               | (files, kind) <-
+                    [ (files, "license-file")       | files <- licenseFiles  pkg ]
+                 ++ [ (files, "extra-source-files") | files <- extraSrcFiles pkg ]
+                 ++ [ (files, "data-files")         | files <- dataFiles     pkg ]
+                 ++ [ (files, "extra-doc-files")    | files <- extraDocFiles pkg ]
+               ]
+
+  missing <- filterM (liftM not . doesFileExist ops . fst) filess
+  return [ PackageBuildWarning {
+             explanation = quote (kind ++ ": " ++ file)
+                        ++ " file does not exist."
+           }
+         | (file, kind) <- missing ]
 
 checkSetupExists :: Monad m => CheckPackageContentOps m
                  -> PackageDescription
@@ -1432,9 +1438,12 @@ checkLocalPathsExist ops pkg = do
   let dirs = [ (dir, kind)
              | bi <- allBuildInfo pkg
              , (dir, kind) <-
-                  [ (dir, "extra-lib-dirs") | dir <- extraLibDirs bi ]
-               ++ [ (dir, "include-dirs")   | dir <- includeDirs  bi ]
-               ++ [ (dir, "hs-source-dirs") | dir <- hsSourceDirs bi ]
+                  [ (dir, "extra-lib-dirs")  | dir <- extraLibDirs  bi ]
+               ++ [ (dir, "include-dirs")    | dir <- includeDirs   bi ]
+               ++ [ (dir, "hs-source-dirs")  | dir <- hsSourceDirs  bi ]
+               ++ [ (dir, "c-sources")       | dir <- cSources      bi ]
+               ++ [ (dir, "js-sources")      | dir <- jsSources     bi ]
+
              , isRelative dir ]
   missing <- filterM (liftM not . doesDirectoryExist ops . fst) dirs
   return [ PackageBuildWarning {