diff --git a/pkgs/development/ocaml-modules/ocaml-ipaddr/default.nix b/pkgs/development/ocaml-modules/ocaml-ipaddr/default.nix
index e96f3f179a9..09cfe1c350d 100644
--- a/pkgs/development/ocaml-modules/ocaml-ipaddr/default.nix
+++ b/pkgs/development/ocaml-modules/ocaml-ipaddr/default.nix
@@ -1,15 +1,23 @@
-{ocaml, findlib, stdenv, fetchurl}:
-
+{ocaml, findlib, stdenv, fetchurl, ocaml_sexplib}:
+assert stdenv.lib.versionAtLeast (stdenv.lib.getVersion ocaml) "3.12";
 stdenv.mkDerivation {
-  name = "ocaml-ipaddr-2.4.0";
+  name = "ocaml-ipaddr-2.5.0";
   
   src = fetchurl {
-    url = https://github.com/mirage/ocaml-ipaddr/archive/2.4.0.tar.gz;
-    sha256 = "0g7qg35w3vzcg37798rhbx7iia83286md3gj5gdhs1qgizlg56wx";
+    url = https://github.com/mirage/ocaml-ipaddr/archive/2.5.0.tar.gz;
+    sha256 = "0zpslxzjs5zdw20j3jaf6fr0w2imnidhrzggmnvwp198r76aq917";
   };
 
   buildInputs = [ocaml findlib];
+  propagatedBuildInputs = [ocaml_sexplib];
 
   createFindlibDestdir = true;
+
+  meta = with stdenv.lib; {
+    description = "An OCaml library for manipulation of IP (and MAC) address representations";
+    license = licenses.isc;
+    maintainers = [ maintainers.vbgl ];
+    platforms = ocaml.meta.platforms;
+  };
   
 }
diff --git a/pkgs/development/ocaml-modules/sexplib/108.08.00.nix b/pkgs/development/ocaml-modules/sexplib/108.08.00.nix
index 3e73b562e7e..3dbb0ea8e81 100644
--- a/pkgs/development/ocaml-modules/sexplib/108.08.00.nix
+++ b/pkgs/development/ocaml-modules/sexplib/108.08.00.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, ocaml, findlib, typeconv}:
+{stdenv, fetchurl, ocaml, findlib, typeconv, camlp4}:
 
 let
   ocaml_version = (builtins.parseDrvName ocaml.name).version;
@@ -14,14 +14,16 @@ stdenv.mkDerivation {
     sha256 = "11z1k1d7dbb5m957klgalimpr0r602xp5zkkbgbffib1bphasarg";
   };
 
-  buildInputs = [ocaml findlib typeconv ];
+  buildInputs = [ocaml findlib];
+  propagatedBuildInputs = [typeconv camlp4];
 
   createFindlibDestdir = true;
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://ocaml.janestreet.com/;
     description = "Library for serializing OCaml values to and from S-expressions";
-    license = stdenv.lib.licenses.asl20;
+    license = licenses.asl20;
+    maintainers = [ maintainers.vbgl ];
     platforms = ocaml.meta.platforms;
   };
 }
diff --git a/pkgs/development/ocaml-modules/sexplib/default.nix b/pkgs/development/ocaml-modules/sexplib/default.nix
index 6f744778875..a32c6a0e2ce 100644
--- a/pkgs/development/ocaml-modules/sexplib/default.nix
+++ b/pkgs/development/ocaml-modules/sexplib/default.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, ocaml, findlib, ocaml_typeconv}:
+{stdenv, fetchurl, ocaml, findlib, ocaml_typeconv, camlp4}:
 
 let
   ocaml_version = (builtins.parseDrvName ocaml.name).version;
@@ -14,14 +14,16 @@ stdenv.mkDerivation {
     sha256 = "0qh0zqp5nakqpmmhh4x7cg03vqj3j2bj4zj0nqdlksai188p9ila";
   };
 
-  buildInputs = [ocaml findlib ocaml_typeconv ];
+  buildInputs = [ocaml findlib];
+  propagatedBuildInputs = [ocaml_typeconv camlp4];
 
   createFindlibDestdir = true;
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://ocaml.janestreet.com/;
     description = "Library for serializing OCaml values to and from S-expressions";
-    license = stdenv.lib.licenses.asl20;
+    license = licenses.asl20;
+    maintainers = [ maintainers.vbgl ];
     platforms = ocaml.meta.platforms;
   };
 }
diff --git a/pkgs/development/ocaml-modules/tyxml/default.nix b/pkgs/development/ocaml-modules/tyxml/default.nix
index 02ac7f381e5..648f0a9cd17 100644
--- a/pkgs/development/ocaml-modules/tyxml/default.nix
+++ b/pkgs/development/ocaml-modules/tyxml/default.nix
@@ -1,29 +1,24 @@
-{stdenv, fetchurl, ocaml, findlib, ocaml_oasis}:
+{stdenv, fetchurl, ocaml, findlib, ocaml_oasis, camlp4}:
 
 stdenv.mkDerivation {
-  name = "tyxml-3.0.0";
+  name = "tyxml-3.1.1";
 
   src = fetchurl {
-    url = http://ocsigen.org/download/tyxml-3.0.0.tar.gz;
-    sha256 = "0cvbmyg4g0lg4f23032cjlxqklisccbjgj47117wm6gva8xi7xa3";
+    url = http://github.com/ocsigen/tyxml/archive/3.1.1.tar.gz;
+    sha256 = "1r8im382r68kn8qy0857nv3y7h42i6ajyclxzmigfai7v2xdd05z";
     };
 
-  buildInputs = [ocaml findlib ocaml_oasis];
+  buildInputs = [ocaml findlib ocaml_oasis camlp4];
 
   createFindlibDestdir = true;
 
-  configurePhase = ''
-  make setup-dev.exe
-  ./setup-dev.exe -configure --prefix $out
-  '';
-
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://ocsigen.org/tyxml/;
     description = "A library that makes it almost impossible for your OCaml programs to generate wrong XML ouput, using static typing";
-    license = "LGPL";
+    license = licenses.lgpl21;
     platforms = ocaml.meta.platforms;
-    maintainers = [
-      stdenv.lib.maintainers.gal_bolle
+    maintainers = with maintainers; [
+      gal_bolle vbgl
       ];
   };