anchor.diff:    ctlpath = lib.makeSearchPath "bin" [ bash gnused gnugrep coreutils utillinux procps ];
   
     fakegit = writeScriptBin "git" ''
  -    #! ${stdenv.shell}
  -    exit 0
  +    #! ${stdenv.shell} -e
  +    if [ "$1" = "describe" ]; then
  +      [ -r .rev ] && cat .rev || true
  +    fi
     '';
   
  -  # These can be extracted from `rebar.config.script`
  +  # These can be extracted from `rebar.config`
     # Some dependencies are from another packages. Try commenting them out; then during build
     # you'll get necessary revision information.
     ejdeps = {
  -    p1_cache_tab = fetchFromGitHub {
  +    cache_tab = fetchFromGitHub {
         owner = "processone";
         repo = "cache_tab";
  -      rev = "f7ea12b0ba962a3d2f9a406d2954cf7de4e27230";
  -      sha256 = "043rz66s6vhcbk02qjhn1r8jv8yyy4gk0gsknmk7ya6wq2v1farw";
  +      rev = "1.0.1";
  +      sha256 = "1mq5vgqskb0v2pdn6i3610hzd9iyjznh8143pdbz8z57rrhxpxg4";
       };
       p1_tls = fetchFromGitHub {
         owner = "processone";
         repo = "tls";
  -      rev = "e56321afd974e9da33da913cd31beebc8e73e75f";
  -      sha256 = "0k8dx8mww2ilr4y5m2llhqh673l0z7r73f0lh7klyf57wfqy7hzk";
  +      rev = "1.0.0";
  +      sha256 = "1q6l5drgmwj4fp4nfh0075lczplia4n40sirk9pd5x76d59qcmnj";
       };
       p1_stringprep = fetchFromGitHub {
         owner = "processone";
         repo = "stringprep";
  -      rev = "3c640237a3a7831dc39de6a6d329d3a9af25c579";
  -      sha256 = "0mwlkivkfj16bdv80jr8kqa0vcqglxkq90m9qn0m6zp4bjc3jm3n";
  +      rev = "1.0.0";
  +      sha256 = "105xc0af61xrd4vjxrg49gxbij8x0fq4yribywa8qly303d1nwwa";
       };
       p1_xml = fetchFromGitHub {
         owner = "processone";
         repo = "xml";
  -      rev = "1c8b016b0ac7986efb823baf1682a43565449e65";
  -      sha256 = "192jhj0cwwypbiass3rm2449410pqyk3mgrdg7yyvqwmjzzkmh87";
  +      rev = "1.1.1";
  +      sha256 = "07zxc8ky78sd2mcbhhrxha68arbbk8vyayn9gwi402avnqcic7cx";
       };
       esip = fetchFromGitHub {
         owner = "processone";
         repo = "p1_sip";
  -      rev = "d662d3fe7f6288b444ea321d854de0bd6d40e022";
  -      sha256 = "1mwzkkv01vr9n13h6h3100jrrlgb683ncq9jymnbxqxk6rn7xjd1";
  +      rev = "1.0.0";
  +      sha256 = "02k920995b0js6srarx0rabavs428rl0dp7zz90x74l8b589zq9a";
       };
       p1_stun = fetchFromGitHub {
         owner = "processone";
         repo = "stun";
  -      rev = "061bdae484268cbf0457ad4797e74b8516df3ad1";
  -      sha256 = "0zaw8yq4sk7x4ybibcq93k9b6rb7fn03i0k8gb2dnlipmbcdd8cf";
  +      rev = "0.9.0";
  +      sha256 = "0ghf2p6z1m55f5pm4pv5gj7h7fdcwcsyqz1wzax4w8bgs9id06dm";
       };
       p1_yaml = fetchFromGitHub {
         owner = "processone";
         repo = "p1_yaml";
  -      rev = "79f756ba73a235c4d3836ec07b5f7f2b55f49638";
  -      sha256 = "05jjw02ay8v34izwgi5zizqp1mj68ypjilxn59c262xj7c169pzh";
  +      rev = "1.0.0";
  +      sha256 = "0is0vr8ygh3fbiyf0jb85cfpfakxmx31fqk6s4j90gmfhlbm16f8";
       };
       p1_utils = fetchFromGitHub {
         owner = "processone";
         repo = "p1_utils";
  -      rev = "d7800881e6702723ce58b7646b60c9e4cd25d563";
  -      sha256 = "07p47ccrdjymjmn6rn9jlcyg515bs9l0iwfbc75qsk10ddnmbvdi";
  +      rev = "1.0.2";
  +      sha256 = "11b71bnc90riy1qplkpwx6l1yr9849jai3ckri35cavfsk35j687";
       };
       jiffy = fetchFromGitHub {
         owner = "davisp";
         repo = "jiffy";
  -      rev = "cfc61a2e952dc3182e0f9b1473467563699992e2";
  -      sha256 = "1c2x71x90jlx4585znxz8fg46q3jxm80nk7v184lf4pqa1snk8kk";
  +      rev = "0.14.5";
  +      sha256 = "1xs01cl4gq1x6sjj7d1qgg4iq9iwzv3cjqjrj0kr7rqrbfqx2nq3";
       };
       oauth2 = fetchFromGitHub {
  -      owner = "prefiks";
  +      owner = "kivra";
         repo = "oauth2";
  -      rev = "e6da9912e5d8f658e7e868f41a102d085bdbef59";
  -      sha256 = "0di33bkj8xc7h17z1fs4birp8a88c1ds72jc4xz2qmz8kh7q9m3k";
  +      rev = "8d129fbf8866930b4ffa6dd84e65bd2b32b9acb8";
  +      sha256 = "0mbmw6668l945iqppba991793nmmkyvvf18zxgdahxcwgxg1majn";
       };
       xmlrpc = fetchFromGitHub {
         owner = "rds13";
         repo = "xmlrpc";
  -      rev = "42e6e96a0fe7106830274feed915125feb1056f3";
  -      sha256 = "10dk480s6z653lr5sap4rcx3zsfmg68hgapvc4jvcyf7vgg12d3s";
  +      rev = "1.15";
  +      sha256 = "0ihwag2hgw9rswxygallc4w1yipgpd6arw3xpr799ib7ybsn8x81";
       };
   
       p1_mysql = fetchFromGitHub {
         owner = "processone";
         repo = "mysql";
  -      rev = "dfa87da95f8fdb92e270741c2a53f796b682f918";
  -      sha256 = "1nw7n1xvid4yqp57s94drdjf6ffap8zpy8hkrz9yffzkhk9biz5y";
  +      rev = "1.0.0";
  +      sha256 = "1v3g75hhfpv5bnrar23y7lsk3pd02xl5cy4mj13j0qxl6bc4dgss";
       };
       p1_pgsql = fetchFromGitHub {
         owner = "processone";
         repo = "pgsql";
  -      rev = "e72c03c60bfcb56bbb5d259342021d9cb3581dac";
  -      sha256 = "0y89995h7g8bi12qi1m4cdzcswsljbv7y8zb43rjg5ss2bcq7kb6";
  +      rev = "1.0.0";
  +      sha256 = "1r7dkjzxhwplmhvgvdx990xn98gpslckah5jpkx8c2gm9nj3xi33";
       };
       sqlite3 = fetchFromGitHub {
         owner = "alexeyr";
         repo = "erlang-sqlite3";
  -      rev = "8350dc603804c503f99c92bfd2eab1dd6885758e";
  -      sha256 = "0d0pbqmi3hsvzjp4vjp7a6bq3pjvkfv0spszh6485x9cmxsbwfpc";
  +      rev = "cbc3505f7a131254265d3ef56191b2581b8cc172";
  +      sha256 = "1xrvygv0zhslsqf8044m5ml1zr6di7znvv2zycg3amsz190w0w2g";
       };
       p1_pam = fetchFromGitHub {
         owner = "processone";
         repo = "epam";
  -      rev = "d3ce290b7da75d780a03e86e7a8198a80e9826a6";
  -      sha256 = "0s0czrgjvc1nw7j66x8b9rlajcap0yfnv6zqd4gs76ky6096qpb0";
  +      rev = "1.0.0";
  +      sha256 = "0dlbmfwndhyg855vnhwyccxcjqzf2wcgc7522mjb9q38cva50rpr";
       };
       p1_zlib = fetchFromGitHub {
         owner = "processone";
         repo = "zlib";
  -      rev = "e3d4222b7aae616d7ef2e7e2fa0bbf451516c602";
  -      sha256 = "0z960nwva8x4lw1k91i53kpn2bjbf1v1amslkyp8sx2gc5zf0gbn";
  +      rev = "1.0.0";
  +      sha256 = "1a6m7wz6cbb8526fwhmgm7mva62absmvyjm8cjnq7cs0mzp18r0m";
  +    };
  +    hamcrest = fetchFromGitHub {
  +      owner = "hyperthunk";
  +      repo = "hamcrest-erlang";
  +      rev = "908a24fda4a46776a5135db60ca071e3d783f9f6";
  +      sha256 = "0irxidwrb37m0xwls6q9nn2zfs3pyxrgbnjgrhnh7gm35ib51hkj";
       };
       riakc = fetchFromGitHub {
         owner = "basho";
         repo = "riak-erlang-client";
  -      rev = "1.4.2";
  -      sha256 = "128jz83n1990m9c2fzwsif6hyapmq46720nzfyyb4z2j75vn85zz";
  +      rev = "527722d12d0433b837cdb92a60900c2cb5df8942";
  +      sha256 = "13rkwibsjsl2gdysvf11r1hqfrf89hjgpa0x0hz2910f2ryqll3y";
       };
       # dependency of riakc
       riak_pb = fetchFromGitHub {
         owner = "basho";
         repo = "riak_pb";
  -      rev = "1.4.4.0";
  -      sha256 = "054fg9gaxk4n0id0qs6k8i919qvxsvmh76m6fgfbmixyfxh5jp3w";
  +      rev = "2.1.0.7";
  +      sha256 = "1p0qmjq069f7j1m29dv36ayvz8m0pcm94ccsnv5blykfg2c5ja0c";
       };
       # dependency of riak_pb
       protobuffs = fetchFromGitHub {
         owner = "basho";
         repo = "erlang_protobuffs";
  -      rev = "0.8.1p1";
  -      sha256 = "1x75a26y1gx6pzr829i4sx2mxm5w40kb6hfd5y511him56jcczna";
  +      rev = "0.8.2";
  +      sha256 = "0w4jmsnc9x2ykqh1q6b12pl8a9973dxdhqk3y0ph17n83q5xz3h7";
       };
       rebar_elixir_plugin = fetchFromGitHub {
  -      owner = "yrashk";
  +      owner = "processone";
         repo = "rebar_elixir_plugin";
  -      rev = "7058379b7c7e017555647f6b9cecfd87cd50f884";
  -      sha256 = "1s5bvbrhal866gbp72lgp0jzphs2cmgmafmka0pylwj30im41c71";
  +      rev = "0.1.0";
  +      sha256 = "0x04ff53mxwd9va8nl4m70dbamp6p4dpxs646c168iqpnpadk3sk";
       };
       elixir = fetchFromGitHub {
         owner = "elixir-lang";
         repo = "elixir";
  -      rev = "1d9548fd285d243721b7eba71912bde2ffd1f6c3";
  -      sha256 = "1lxn9ly73rm797p6slfx7grsq32nn6bz15qhkbra834rj01fqzh8";
  +      rev = "v1.1.0";
  +      sha256 = "0r5673x2qdvfbwmvyvj8ddvzgxnkl3cv9jsf1yzsxgdifjbrzwx7";
       };
       p1_iconv = fetchFromGitHub {
         owner = "processone";
         repo = "eiconv";
  -      rev = "8b7542b1aaf0a851f335e464956956985af6d9a2";
  -      sha256 = "1w3k41fpynqylc2vnirz0fymlidpz0nnym0070f1f1s3pd6g5906";
  +      rev = "0.9.0";
  +      sha256 = "1ikccpj3aq6mip6slrq8c7w3kilpb82dr1jdy8kwajmiy9cmsq97";
       };
       lager = fetchFromGitHub {
         owner = "basho";
         repo = "lager";
  -      rev = "4d2ec8c701e1fa2d386f92f2b83b23faf8608ac3";
  -      sha256 = "03aav3cid0qpl1n8dn83hk0p70rw05nqvhq1abdh219nrlk9gfmx";
  +      rev = "3.0.2";
  +      sha256 = "04l40dlqpl2y6ddpbpknmnjf537bjvrmg8r0jnmw1h60dgyb2ydk";
       };
       # dependency of lager
       goldrush = fetchFromGitHub {
  
positive.code:   ;
  
    configureFlags =
      [ "--enable-nif"
        (lib.enableFeature withMysql "mysql")
        (lib.enableFeature withPgsql "pgsql")
        (lib.enableFeature withSqlite "sqlite")
        (lib.enableFeature withPam "pam")
  
negative.code:     p1_logger = fetchFromGitHub {
        owner = "processone";
        repo = "p1_logger";
        rev = "1.0.0";
        sha256 = "0z11xsr139a75w09syjws4sja6ky2l9rsrwkjr6wcl7p1jz02h4r";
      };
      meck = fetchFromGitHub {
        owner = "eproxus";
        repo = "meck";
        rev = "0.8.2";
        sha256 = "0s4qbvryap46cz63awpbv5zzmlcay5pn2lixgmgvcjarqv70cbs7";
      };
      eredis = fetchFromGitHub {
        owner = "wooga";
        repo = "eredis";
        rev = "v1.0.8";
        sha256 = "10fr3kbc2nd2liggsq4y77nfirndzapcxzkjgyp06bpr9cjlvhlm";
      };
  
    };
  
  in stdenv.mkDerivation rec {
    version = "16.01";
    name = "ejabberd-${version}";
  
    src = fetchurl {
      url = "http://www.process-one.net/downloads/ejabberd/${version}/${name}.tgz";
      sha256 = "10fnsw52gxybw731yka63ma8mj39g4i0nsancwp9nlvhb2flgk72";
    };
  
    nativeBuildInputs = [ fakegit ];
  