diff --git a/pkgs/applications/science/math/sloane/default.nix b/pkgs/applications/science/math/sloane/default.nix
index bf2cf32d6465..72c2028e63c9 100644
--- a/pkgs/applications/science/math/sloane/default.nix
+++ b/pkgs/applications/science/math/sloane/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, ansiTerminal, filepath, HTTP, network, optparseApplicative
 , terminalSize, text, time, zlib
 }:
diff --git a/pkgs/applications/version-management/darcs/default.nix b/pkgs/applications/version-management/darcs/default.nix
index b564242c9467..d53b38c28c32 100644
--- a/pkgs/applications/version-management/darcs/default.nix
+++ b/pkgs/applications/version-management/darcs/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, curl, extensibleExceptions, filepath, hashedStorage
 , haskeline, html, HTTP, mmap, mtl, network, parsec, random
 , regexCompat, tar, terminfo, text, utf8String, vector, zlib
@@ -15,15 +17,15 @@ cabal.mkDerivation (self: {
     utf8String vector zlib
   ];
   extraLibraries = [ curl ];
+  jailbreak = true;
   doCheck = false;
   postInstall = ''
     mkdir -p $out/etc/bash_completion.d
     mv contrib/darcs_completion $out/etc/bash_completion.d/darcs
   '';
-  jailbreak = true;
   meta = {
-    homepage = http://darcs.net/;
-    description = "A distributed, interactive, smart revision control system";
+    homepage = "http://darcs.net/";
+    description = "a distributed, interactive, smart revision control system";
     license = "GPL";
     platforms = self.ghc.meta.platforms;
     maintainers = [ self.stdenv.lib.maintainers.andres ];
diff --git a/pkgs/applications/version-management/git-and-tools/git-annex/default.nix b/pkgs/applications/version-management/git-and-tools/git-annex/default.nix
index b4acd0e854e3..6764c232bd83 100644
--- a/pkgs/applications/version-management/git-and-tools/git-annex/default.nix
+++ b/pkgs/applications/version-management/git-and-tools/git-annex/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, aeson, async, blazeBuilder, bloomfilter, bup, byteable
 , caseInsensitive, clientsession, cryptoApi, cryptohash, curl
 , dataDefault, dataenc, DAV, dbus, dlist, dns, editDistance
diff --git a/pkgs/applications/window-managers/xmonad/default.nix b/pkgs/applications/window-managers/xmonad/default.nix
index c80c8f1c9db0..08b85a5530fd 100644
--- a/pkgs/applications/window-managers/xmonad/default.nix
+++ b/pkgs/applications/window-managers/xmonad/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, extensibleExceptions, filepath, mtl, utf8String, X11 }:
 
 cabal.mkDerivation (self: {
@@ -14,12 +16,10 @@ cabal.mkDerivation (self: {
     mkdir -p $out/share/man/man1
     mv "$out/"**"/man/"*.1 $out/share/man/man1/
   '';
-
   patches = [
     # Patch to make xmonad use XMONAD_{GHC,XMESSAGE} (if available).
     ./xmonad_ghc_var_0.11.patch
   ];
-
   meta = {
     homepage = "http://xmonad.org";
     description = "A tiling window manager";
diff --git a/pkgs/development/libraries/haskell/HFuse/default.nix b/pkgs/development/libraries/haskell/HFuse/default.nix
index 03ef1f714eeb..7ddacbc79ac8 100644
--- a/pkgs/development/libraries/haskell/HFuse/default.nix
+++ b/pkgs/development/libraries/haskell/HFuse/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, fuse }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/djinn/default.nix b/pkgs/development/libraries/haskell/djinn/default.nix
index 6e8a52bb78b0..d643b87c42ea 100644
--- a/pkgs/development/libraries/haskell/djinn/default.nix
+++ b/pkgs/development/libraries/haskell/djinn/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, haskeline, mtl }:
 
 cabal.mkDerivation (self: {
@@ -7,9 +9,6 @@ cabal.mkDerivation (self: {
   isLibrary = false;
   isExecutable = true;
   buildDepends = [ haskeline mtl ];
-  preConfigure = self.stdenv.lib.optionalString self.stdenv.isDarwin ''
-    sed -i 's/-Wall -optl-Wl/-Wall/' djinn.cabal
-  '';
   meta = {
     homepage = "http://www.augustsson.net/Darcs/Djinn/";
     description = "Generate Haskell code from a type";
diff --git a/pkgs/development/libraries/haskell/ghc-heap-view/default.nix b/pkgs/development/libraries/haskell/ghc-heap-view/default.nix
index 679ced622d9b..c32d3be53080 100644
--- a/pkgs/development/libraries/haskell/ghc-heap-view/default.nix
+++ b/pkgs/development/libraries/haskell/ghc-heap-view/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, binary, transformers }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/ghc-mod/default.nix b/pkgs/development/libraries/haskell/ghc-mod/default.nix
index 7956117bb945..b5ed78d7212f 100644
--- a/pkgs/development/libraries/haskell/ghc-mod/default.nix
+++ b/pkgs/development/libraries/haskell/ghc-mod/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, Cabal, convertible, deepseq, doctest, emacs, filepath
 , ghcSybUtils, hlint, hspec, ioChoice, syb, time, transformers
 }:
diff --git a/pkgs/development/libraries/haskell/ghc-paths/default.nix b/pkgs/development/libraries/haskell/ghc-paths/default.nix
index b930e993dcc4..0a2b7dc18f3c 100644
--- a/pkgs/development/libraries/haskell/ghc-paths/default.nix
+++ b/pkgs/development/libraries/haskell/ghc-paths/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/ghc-vis/default.nix b/pkgs/development/libraries/haskell/ghc-vis/default.nix
index a15ed9d1c47c..bfcc3e70472e 100644
--- a/pkgs/development/libraries/haskell/ghc-vis/default.nix
+++ b/pkgs/development/libraries/haskell/ghc-vis/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, cairo, deepseq, fgl, ghcHeapView, graphviz, gtk, mtl
 , svgcairo, text, transformers, xdot
 }:
diff --git a/pkgs/development/libraries/haskell/haskell-src/1.0.1.5.nix b/pkgs/development/libraries/haskell/haskell-src/1.0.1.5.nix
index cfaabe7f6b01..02032c21120b 100644
--- a/pkgs/development/libraries/haskell/haskell-src/1.0.1.5.nix
+++ b/pkgs/development/libraries/haskell/haskell-src/1.0.1.5.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, happy, syb }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/holy-project/default.nix b/pkgs/development/libraries/haskell/holy-project/default.nix
index 4e751d9c003f..09141bf6d0a4 100644
--- a/pkgs/development/libraries/haskell/holy-project/default.nix
+++ b/pkgs/development/libraries/haskell/holy-project/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, aeson, ansiTerminal, Cabal, filepath, hastache
 , httpConduit, HUnit, lens, QuickCheck, random, smallcheck, split
 , syb, tasty, tastyHunit, tastyQuickcheck, tastySmallcheck, text
diff --git a/pkgs/development/libraries/haskell/imm/default.nix b/pkgs/development/libraries/haskell/imm/default.nix
index 38bc9bbfde70..54f61e23a45f 100644
--- a/pkgs/development/libraries/haskell/imm/default.nix
+++ b/pkgs/development/libraries/haskell/imm/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, async, caseInsensitive, cond, dataDefault, dyre, feed
 , filepath, hslogger, httpConduit, httpTypes, lens, mimeMail
 , monadControl, mtl, network, opml, random, resourcet, text
@@ -24,4 +26,4 @@ cabal.mkDerivation (self: {
     platforms = self.ghc.meta.platforms;
     maintainers = [ "Daniel Bergey <bergey@teallabs.org>" ];
   };
-})
\ No newline at end of file
+})
diff --git a/pkgs/development/libraries/haskell/ncurses/default.nix b/pkgs/development/libraries/haskell/ncurses/default.nix
index 2b566f79a98a..7e9ac0ddd95e 100644
--- a/pkgs/development/libraries/haskell/ncurses/default.nix
+++ b/pkgs/development/libraries/haskell/ncurses/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, c2hs, ncurses, text, transformers }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/network-transport-tcp/default.nix b/pkgs/development/libraries/haskell/network-transport-tcp/default.nix
index 728a40d8d3e6..b4a70eb68436 100644
--- a/pkgs/development/libraries/haskell/network-transport-tcp/default.nix
+++ b/pkgs/development/libraries/haskell/network-transport-tcp/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, dataAccessor, network, networkTransport
 , networkTransportTests
 }:
diff --git a/pkgs/development/libraries/haskell/oeis/default.nix b/pkgs/development/libraries/haskell/oeis/default.nix
index e7da848e4b22..b58df3be3148 100644
--- a/pkgs/development/libraries/haskell/oeis/default.nix
+++ b/pkgs/development/libraries/haskell/oeis/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, HTTP, HUnit, network, testFramework, testFrameworkHunit }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/readline/default.nix b/pkgs/development/libraries/haskell/readline/default.nix
index 6090fc8578a2..9a05fed7e125 100644
--- a/pkgs/development/libraries/haskell/readline/default.nix
+++ b/pkgs/development/libraries/haskell/readline/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, readline, ncurses }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/singletons/default.nix b/pkgs/development/libraries/haskell/singletons/default.nix
index aeace4d3fceb..c4074b9d62c3 100644
--- a/pkgs/development/libraries/haskell/singletons/default.nix
+++ b/pkgs/development/libraries/haskell/singletons/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, Cabal, constraints, filepath, mtl, tasty, tastyGolden
 , thDesugar
 }:
diff --git a/pkgs/development/libraries/haskell/snap/snap.nix b/pkgs/development/libraries/haskell/snap/snap.nix
index f89a0607da9a..189750bd4464 100644
--- a/pkgs/development/libraries/haskell/snap/snap.nix
+++ b/pkgs/development/libraries/haskell/snap/snap.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, aeson, attoparsec, cereal, clientsession, comonad
 , configurator, directoryTree, dlist, errors, filepath, hashable
 , heist, lens, logict, MonadCatchIOTransformers, mtl, mwcRandom
diff --git a/pkgs/development/libraries/haskell/sparse/default.nix b/pkgs/development/libraries/haskell/sparse/default.nix
index f498da219395..c2fbf368f535 100644
--- a/pkgs/development/libraries/haskell/sparse/default.nix
+++ b/pkgs/development/libraries/haskell/sparse/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, contravariant, deepseq, doctest, filepath, hlint
 , hybridVectors, lens, linear, mtl, primitive, QuickCheck
 , semigroups, simpleReflect, testFramework
diff --git a/pkgs/development/libraries/haskell/tz/default.nix b/pkgs/development/libraries/haskell/tz/default.nix
index 95cd928a99e9..ead6e4f55581 100644
--- a/pkgs/development/libraries/haskell/tz/default.nix
+++ b/pkgs/development/libraries/haskell/tz/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, binary, bindingsPosix, deepseq, HUnit, pkgs_tzdata
 , QuickCheck, testFramework, testFrameworkHunit
 , testFrameworkQuickcheck2, testFrameworkTh, time, tzdata, vector
diff --git a/pkgs/development/libraries/haskell/utf8-string/default.nix b/pkgs/development/libraries/haskell/utf8-string/default.nix
index 1233ce8806d3..405dbecb6ba4 100644
--- a/pkgs/development/libraries/haskell/utf8-string/default.nix
+++ b/pkgs/development/libraries/haskell/utf8-string/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/wxHaskell/wx.nix b/pkgs/development/libraries/haskell/wxHaskell/wx.nix
index 90bfdc5ca0a3..c10897b4b11c 100644
--- a/pkgs/development/libraries/haskell/wxHaskell/wx.nix
+++ b/pkgs/development/libraries/haskell/wxHaskell/wx.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, stm, wxcore }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/wxHaskell/wxc.nix b/pkgs/development/libraries/haskell/wxHaskell/wxc.nix
index b816c3007f99..4026a892f6ed 100644
--- a/pkgs/development/libraries/haskell/wxHaskell/wxc.nix
+++ b/pkgs/development/libraries/haskell/wxHaskell/wxc.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, libX11, mesa, wxdirect, wxGTK }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/development/libraries/haskell/wxHaskell/wxcore.nix b/pkgs/development/libraries/haskell/wxHaskell/wxcore.nix
index d404099bf53f..8fc4df1a0ce1 100644
--- a/pkgs/development/libraries/haskell/wxHaskell/wxcore.nix
+++ b/pkgs/development/libraries/haskell/wxHaskell/wxcore.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, filepath, libX11, mesa, parsec, stm, time, wxc, wxdirect
 , wxGTK
 }:
diff --git a/pkgs/tools/package-management/cabal-install/0.14.0.nix b/pkgs/tools/package-management/cabal-install/0.14.0.nix
index 15fe5f1e22ce..72ed74149716 100644
--- a/pkgs/tools/package-management/cabal-install/0.14.0.nix
+++ b/pkgs/tools/package-management/cabal-install/0.14.0.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, Cabal, filepath, HTTP, mtl, network, random, time, zlib }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/tools/package-management/cabal-install/1.16.0.2.nix b/pkgs/tools/package-management/cabal-install/1.16.0.2.nix
index 8f28f57c18f3..14fc25bc8dc7 100644
--- a/pkgs/tools/package-management/cabal-install/1.16.0.2.nix
+++ b/pkgs/tools/package-management/cabal-install/1.16.0.2.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, Cabal, filepath, HTTP, mtl, network, random, time, zlib }:
 
 cabal.mkDerivation (self: {
diff --git a/pkgs/tools/package-management/cabal-install/1.18.0.3.nix b/pkgs/tools/package-management/cabal-install/1.18.0.3.nix
index 041cc471cab5..31d43cc85d89 100644
--- a/pkgs/tools/package-management/cabal-install/1.18.0.3.nix
+++ b/pkgs/tools/package-management/cabal-install/1.18.0.3.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, Cabal, filepath, HTTP, HUnit, mtl, network, QuickCheck
 , random, stm, testFramework, testFrameworkHunit
 , testFrameworkQuickcheck2, time, zlib
diff --git a/pkgs/tools/package-management/cabal-install/1.20.0.3.nix b/pkgs/tools/package-management/cabal-install/1.20.0.3.nix
index ffcaee203b7d..8c136dc9dbb0 100644
--- a/pkgs/tools/package-management/cabal-install/1.20.0.3.nix
+++ b/pkgs/tools/package-management/cabal-install/1.20.0.3.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, Cabal, filepath, HTTP, HUnit, mtl, network, QuickCheck
 , random, stm, testFramework, testFrameworkHunit
 , testFrameworkQuickcheck2, time, zlib
diff --git a/pkgs/tools/typesetting/lhs2tex/default.nix b/pkgs/tools/typesetting/lhs2tex/default.nix
index ade7fd202d53..ce531a920223 100644
--- a/pkgs/tools/typesetting/lhs2tex/default.nix
+++ b/pkgs/tools/typesetting/lhs2tex/default.nix
@@ -1,3 +1,5 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
 { cabal, filepath, mtl, regexCompat, texLive }:
 
 cabal.mkDerivation (self: {