doesn't work, asking in

exthereum/exth_crypto#8 (comment)

apps/omg_api/mix.exs

@@ -45,7 +45,6 @@ defmodule OMG.API.MixProject do
       {:jsonrpc2, "~> 1.1", only: [:test]},
       {:merkle_tree,
        git: "https://github.com/omisego/merkle_tree.git", branch: "feature/omg-184-add-option-to-not-hash-leaves"},
-      {:libsecp256k1, "~> 0.1.2", compile: "${HOME}/.mix/rebar compile", override: true},
       #
       {:omg_db, in_umbrella: true},
       {:omg_eth, in_umbrella: true}

apps/omg_watcher/mix.exs

@@ -47,7 +47,6 @@ defmodule OMG.Watcher.Mixfile do
       # NOTE: fixed version needed b/c Plug.Conn.WrapperError.reraise/3 is deprecated... 2 occurences in umbrella.
       {:plug, "1.5.0", override: true},
       {:socket, "~> 0.3"},
-      {:libsecp256k1, "~> 0.1.4", compile: "${HOME}/.mix/rebar compile", override: true},
       # NOTE: need this explictly, since :omg_jsonrpc won't start jsonrpc2 automatically
       {:jsonrpc2, "~> 1.1"},
       {:briefly, "~> 0.3", only: [:dev, :test]},

mix.exs

@@ -38,10 +38,7 @@ defmodule OMG.Umbrella.MixProject do
       {
         :ex_unit_fixtures,
         git: "https://github.com/omisego/ex_unit_fixtures.git", branch: "feature/require_files_not_load", only: [:test]
-      },
-      # NOTE: we're overriding for the sake of `omg_api` mix.exs deps. Otherwise the override is ignored
-      # TODO: making it consistent is advised: maybe discuss with exth_crypto and submit pr there?
-      {:libsecp256k1, "~> 0.1.4", compile: "${HOME}/.mix/rebar compile", override: true}
+      }
     ]
   end
 end

mix.lock

@@ -1,6 +1,6 @@
 %{
   "abi": {:git, "https://github.com/omisego/abi.git", "b2fbb68a5819ae04d817bf85c18f0746d0556093", [branch: "encode_dynamic_types"]},
-  "binary": {:hex, :binary, "0.0.4", "dd077db70c0ded3e85c132b802338e14b80694684a7e2277666bfa4004b7fa66", [:mix], [], "hexpm"},
+  "binary": {:hex, :binary, "0.0.5", "20d816f7274ea34f1b673b4cff2fdb9ebec9391a7a68c349070d515c66b1b2cf", [:mix], [], "hexpm"},
   "blockchain": {:hex, :blockchain, "0.1.7", "6efdadb84242cbbe201f78ab3a472b2a155c1e86b8787eeb7fbc83ea58f94b99", [:mix], [{:evm, "~> 0.1.14", [hex: :evm, repo: "hexpm", optional: false]}, {:ex_rlp, "~> 0.2.1", [hex: :ex_rlp, repo: "hexpm", optional: false]}, {:keccakf1600, "~> 2.0.0", [hex: :keccakf1600_orig, repo: "hexpm", optional: false]}, {:libsecp256k1, "~> 0.1.4", [hex: :libsecp256k1, repo: "hexpm", optional: false]}, {:merkle_patricia_tree, "~> 0.2.6", [hex: :merkle_patricia_tree, repo: "hexpm", optional: false]}, {:poison, "~> 3.1.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm"},
   "briefly": {:hex, :briefly, "0.3.0", "16e6b76d2070ebc9cbd025fa85cf5dbaf52368c4bd896fb482b5a6b95a540c2f", [:mix], [], "hexpm"},
   "bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [:mix], [], "hexpm"},
@@ -24,7 +24,7 @@
   "exexec": {:git, "https://github.com/pthomalla/exexec.git", "0b8e0a781f72d340355b61979f0d23505356fbe6", [branch: "add_streams"]},
   "exjsx": {:hex, :exjsx, "4.0.0", "60548841e0212df401e38e63c0078ec57b33e7ea49b032c796ccad8cde794b5c", [:mix], [{:jsx, "~> 2.8.0", [hex: :jsx, repo: "hexpm", optional: false]}], "hexpm"},
   "exleveldb": {:hex, :exleveldb, "0.11.1", "37c0414208a50d2419d8246305e6c4a33ed339c25c0bdfa27774795e1e089f7b", [:mix], [{:eleveldb, "~> 2.2.19", [hex: :eleveldb, repo: "hexpm", optional: false]}], "hexpm"},
-  "exth_crypto": {:hex, :exth_crypto, "0.1.4", "11f9084dfd70d4f9e96f2710a472f4e6b23044b97530c719550c2b0450ffeb61", [:mix], [{:binary, "~> 0.0.4", [hex: :binary, repo: "hexpm", optional: false]}, {:keccakf1600, "~> 2.0.0", [hex: :keccakf1600_orig, repo: "hexpm", optional: false]}, {:libsecp256k1, "~> 0.1.3", [hex: :libsecp256k1, repo: "hexpm", optional: false]}], "hexpm"},
+  "exth_crypto": {:hex, :exth_crypto, "0.1.6", "8e636a9bcb75d8e32451be96e547a495121ed2178d078db294edb0f81f7cf2e8", [:mix], [{:binary, "~> 0.0.4", [hex: :binary, repo: "hexpm", optional: false]}, {:keccakf1600, "~> 2.0.0", [hex: :keccakf1600_orig, repo: "hexpm", optional: false]}, {:libsecp256k1, "~> 0.1.9", [hex: :libsecp256k1, repo: "hexpm", optional: false]}], "hexpm"},
   "gettext": {:hex, :gettext, "0.15.0", "40a2b8ce33a80ced7727e36768499fc9286881c43ebafccae6bab731e2b2b8ce", [:mix], [], "hexpm"},
   "hackney": {:hex, :hackney, "1.13.0", "24edc8cd2b28e1c652593833862435c80661834f6c9344e84b6a2255e7aeef03", [:rebar3], [{:certifi, "2.3.1", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "5.1.2", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "1.0.1", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "1.0.2", [hex: :mimerl, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "1.1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm"},
   "hex_prefix": {:hex, :hex_prefix, "0.1.0", "e96b5cbb6ad8493196ce193726240023f5ce0ae0753118a19a5b43e2db0267ca", [:mix], [], "hexpm"},
@@ -33,13 +33,14 @@
   "jsonrpc2": {:hex, :jsonrpc2, "1.1.0", "264f7613abb20168f98e744afebc5c0f2c22c7702eb2880e9352d69260627eda", [:mix], [{:cowboy, "~> 1.1 or ~> 2.4", [hex: :cowboy, repo: "hexpm", optional: true]}, {:hackney, "~> 1.6", [hex: :hackney, repo: "hexpm", optional: true]}, {:jiffy, "~> 0.14", [hex: :jiffy, repo: "hexpm", optional: true]}, {:plug, "~> 1.1", [hex: :plug, repo: "hexpm", optional: true]}, {:poison, "~> 3.0 or ~> 2.0", [hex: :poison, repo: "hexpm", optional: true]}, {:ranch, "~> 1.2", [hex: :ranch, repo: "hexpm", optional: true]}, {:shackle, "~> 0.3", [hex: :shackle, repo: "hexpm", optional: true]}], "hexpm"},
   "jsx": {:hex, :jsx, "2.8.3", "a05252d381885240744d955fbe3cf810504eb2567164824e19303ea59eef62cf", [:mix, :rebar3], [], "hexpm"},
   "keccakf1600": {:hex, :keccakf1600_orig, "2.0.0", "0a7217ddb3ee8220d449bbf7575ec39d4e967099f220a91e3dfca4dbaef91963", [:rebar3], [], "hexpm"},
-  "libsecp256k1": {:hex, :libsecp256k1, "0.1.4", "42b7f76d8e32f85f578ccda0abfdb1afa0c5c231d1fd8aeab9cda352731a2d83", [:rebar3], [], "hexpm"},
+  "libsecp256k1": {:hex, :libsecp256k1, "0.1.9", "e725f31364cda7b554d56ce2bb976241303dde5ffd1ad59598513297bf1f2af6", [:make, :mix], [{:mix_erlang_tasks, "0.1.0", [hex: :mix_erlang_tasks, repo: "hexpm", optional: false]}], "hexpm"},
   "licensir": {:hex, :licensir, "0.2.7", "ad902c337560ccd70de843e5b208c1db08ba2f879ee01c9389023b779131f30a", [:mix], [], "hexpm"},
   "merkle_patricia_tree": {:hex, :merkle_patricia_tree, "0.2.6", "4adcc768318582b4ee1cc7ec10b8851fa5708804ead5b7ca9153cec07d57bbdc", [:mix], [{:ex_rlp, "~> 0.2.0", [hex: :ex_rlp, repo: "hexpm", optional: false]}, {:exleveldb, "~> 0.11.1", [hex: :exleveldb, repo: "hexpm", optional: false]}, {:hex_prefix, "~> 0.1.0", [hex: :hex_prefix, repo: "hexpm", optional: false]}, {:keccakf1600, "~> 2.0.0", [hex: :keccakf1600_orig, repo: "hexpm", optional: false]}], "hexpm"},
   "merkle_tree": {:git, "https://github.com/omisego/merkle_tree.git", "8862ee64776d0e93466d3e28cc61a27ce77b85c0", [branch: "feature/omg-184-add-option-to-not-hash-leaves"]},
   "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], [], "hexpm"},
   "mime": {:hex, :mime, "1.3.0", "5e8d45a39e95c650900d03f897fbf99ae04f60ab1daa4a34c7a20a5151b7a5fe", [:mix], [], "hexpm"},
   "mimerl": {:hex, :mimerl, "1.0.2", "993f9b0e084083405ed8252b99460c4f0563e41729ab42d9074fd5e52439be88", [:rebar3], [], "hexpm"},
+  "mix_erlang_tasks": {:hex, :mix_erlang_tasks, "0.1.0", "36819fec60b80689eb1380938675af215565a89320a9e29c72c70d97512e4649", [:mix], [], "hexpm"},
   "parse_trans": {:hex, :parse_trans, "3.2.0", "2adfa4daf80c14dc36f522cf190eb5c4ee3e28008fc6394397c16f62a26258c2", [:rebar3], [], "hexpm"},
   "phoenix": {:hex, :phoenix, "1.3.2", "2a00d751f51670ea6bc3f2ba4e6eb27ecb8a2c71e7978d9cd3e5de5ccf7378bd", [:mix], [{:cowboy, "~> 1.0", [hex: :cowboy, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 1.0", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:plug, "~> 1.3.3 or ~> 1.4", [hex: :plug, repo: "hexpm", optional: false]}, {:poison, "~> 2.2 or ~> 3.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm"},
   "phoenix_ecto": {:hex, :phoenix_ecto, "3.3.0", "702f6e164512853d29f9d20763493f2b3bcfcb44f118af2bc37bb95d0801b480", [:mix], [{:ecto, "~> 2.1", [hex: :ecto, repo: "hexpm", optional: false]}, {:phoenix_html, "~> 2.9", [hex: :phoenix_html, repo: "hexpm", optional: true]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm"},