diff --git a/pkgs/development/libraries/openldap/default.nix b/pkgs/development/libraries/openldap/default.nix
index a99cc51de4a..b197236a649 100644
--- a/pkgs/development/libraries/openldap/default.nix
+++ b/pkgs/development/libraries/openldap/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, openssl, cyrus_sasl, db, groff }:
+{ stdenv, fetchurl, openssl, cyrus_sasl, db, groff, libtool }:
 
 stdenv.mkDerivation rec {
   name = "openldap-2.4.44";
@@ -13,11 +13,12 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  buildInputs = [ openssl cyrus_sasl db groff ];
+  buildInputs = [ openssl cyrus_sasl db groff libtool ];
 
   configureFlags =
     [ "--enable-overlays"
       "--disable-dependency-tracking"   # speeds up one-time build
+      "--enable-modules"
     ] ++ stdenv.lib.optional (openssl == null) "--without-tls"
       ++ stdenv.lib.optional (cyrus_sasl == null) "--without-cyrus-sasl"
       ++ stdenv.lib.optional stdenv.isFreeBSD "--with-pic";
@@ -36,6 +37,10 @@ stdenv.mkDerivation rec {
     rm -r libraries/*/.libs
   '';
 
+  postInstall = ''
+    chmod +x $out/lib/*.so
+  '';
+
   meta = with stdenv.lib; {
     homepage    = http://www.openldap.org/;
     description = "An open source implementation of the Lightweight Directory Access Protocol";