diff --git a/pkgs/development/tools/parsing/alex/2.3.1.nix b/pkgs/development/tools/parsing/alex/2.3.1.nix
deleted file mode 100644
index 83138e2e0ffd..000000000000
--- a/pkgs/development/tools/parsing/alex/2.3.1.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-{ cabal, perl }:
-
-cabal.mkDerivation (self: {
-  pname = "alex";
-  version = "2.3.1";
-  sha256 = "cdd42fd992a72fedeff1f38debc21aa315d90dc070f0945d7819c0bccd549a44";
-  isLibrary = false;
-  isExecutable = true;
-  buildTools = [ perl ];
-  doCheck = false;
-  patches = [ ./adapt-crazy-perl-regex-for-cpp-4.8.0.patch ];
-  meta = {
-    homepage = "http://www.haskell.org/alex/";
-    description = "Alex is a tool for generating lexical analysers in Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})
diff --git a/pkgs/development/tools/parsing/alex/2.3.2.nix b/pkgs/development/tools/parsing/alex/2.3.2.nix
deleted file mode 100644
index 0bc13d160170..000000000000
--- a/pkgs/development/tools/parsing/alex/2.3.2.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-{ cabal, perl }:
-
-cabal.mkDerivation (self: {
-  pname = "alex";
-  version = "2.3.2";
-  sha256 = "6715a4c27b15a74d8f31cbb6a7d654b9cb6766d74980c75b65dee7c627049f43";
-  isLibrary = false;
-  isExecutable = true;
-  buildTools = [ perl ];
-  doCheck = false;
-  patches = [ ./adapt-crazy-perl-regex-for-cpp-4.8.0.patch ];
-  meta = {
-    homepage = "http://www.haskell.org/alex/";
-    description = "Alex is a tool for generating lexical analysers in Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})
diff --git a/pkgs/development/tools/parsing/alex/2.3.3.nix b/pkgs/development/tools/parsing/alex/2.3.3.nix
deleted file mode 100644
index ccef30058c50..000000000000
--- a/pkgs/development/tools/parsing/alex/2.3.3.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-{ cabal, perl }:
-
-cabal.mkDerivation (self: {
-  pname = "alex";
-  version = "2.3.3";
-  sha256 = "338fc492a1fddd6c528d0eb89857cadab211cb42680aeee1f9702bbfa7c5e1c8";
-  isLibrary = false;
-  isExecutable = true;
-  buildTools = [ perl ];
-  doCheck = false;
-  patches = [ ./adapt-crazy-perl-regex-for-cpp-4.8.0.patch ];
-  meta = {
-    homepage = "http://www.haskell.org/alex/";
-    description = "Alex is a tool for generating lexical analysers in Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})
diff --git a/pkgs/development/tools/parsing/alex/3.0.1.nix b/pkgs/development/tools/parsing/alex/3.0.1.nix
deleted file mode 100644
index 7dc18c63c915..000000000000
--- a/pkgs/development/tools/parsing/alex/3.0.1.nix
+++ /dev/null
@@ -1,21 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, perl, QuickCheck }:
-
-cabal.mkDerivation (self: {
-  pname = "alex";
-  version = "3.0.1";
-  sha256 = "1w7s9kzgr4kfh6cyhb4qkvxwy9gcw3xa1d2k5dy575k3wk73awkj";
-  isLibrary = false;
-  isExecutable = true;
-  buildDepends = [ QuickCheck ];
-  buildTools = [ perl ];
-  doCheck = false;
-  meta = {
-    homepage = "http://www.haskell.org/alex/";
-    description = "Alex is a tool for generating lexical analysers in Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/tools/parsing/alex/3.0.2.nix b/pkgs/development/tools/parsing/alex/3.0.2.nix
deleted file mode 100644
index c18c5d89d1be..000000000000
--- a/pkgs/development/tools/parsing/alex/3.0.2.nix
+++ /dev/null
@@ -1,21 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, perl, QuickCheck }:
-
-cabal.mkDerivation (self: {
-  pname = "alex";
-  version = "3.0.2";
-  sha256 = "0r1i10i9svnd0ayd229d8hgndgc6q8ghabw6zzghwviw5hs36zlr";
-  isLibrary = false;
-  isExecutable = true;
-  buildDepends = [ QuickCheck ];
-  buildTools = [ perl ];
-  doCheck = false;
-  meta = {
-    homepage = "http://www.haskell.org/alex/";
-    description = "Alex is a tool for generating lexical analysers in Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/tools/parsing/alex/3.0.5.nix b/pkgs/development/tools/parsing/alex/3.0.5.nix
deleted file mode 100644
index af32598ee473..000000000000
--- a/pkgs/development/tools/parsing/alex/3.0.5.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-{ cabal, fetchpatch, perl, QuickCheck }:
-
-cabal.mkDerivation (self: {
-  pname = "alex";
-  version = "3.0.5";
-  sha256 = "0ncnp7cl7dlfcrwzzcp8j59i9j5r66wim1yib9g3b3jkl0bn8cn3";
-  isLibrary = false;
-  isExecutable = true;
-  buildDepends = [ QuickCheck ];
-  buildTools = [ perl ];
-  patches = [ (fetchpatch { url="http://github.com/simonmar/alex/pull/21.patch"; sha256="050psfwmjlxhyxiy65jsn3v6b9rnfzy8x5q9mmhzwbirqwi0zkfm"; }) ];
-  meta = {
-    homepage = "http://www.haskell.org/alex/";
-    description = "Alex is a tool for generating lexical analysers in Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 93adaf1dde15..9dd9e2912cd8 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -2997,13 +2997,7 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   # Development tools.
 
-  alex_2_3_1 = callPackage ../development/tools/parsing/alex/2.3.1.nix {};
-  alex_2_3_2 = callPackage ../development/tools/parsing/alex/2.3.2.nix {};
-  alex_2_3_3 = callPackage ../development/tools/parsing/alex/2.3.3.nix {};
   alex_2_3_5 = callPackage ../development/tools/parsing/alex/2.3.5.nix {};
-  alex_3_0_1 = callPackage ../development/tools/parsing/alex/3.0.1.nix {};
-  alex_3_0_2 = callPackage ../development/tools/parsing/alex/3.0.2.nix {};
-  alex_3_0_5 = callPackage ../development/tools/parsing/alex/3.0.5.nix {};
   alex_3_1_3 = callPackage ../development/tools/parsing/alex/3.1.3.nix {};
   alex = self.alex_3_1_3;