From 8b2d889aebdfe60b756005eec2013ac0767e5bfc Mon Sep 17 00:00:00 2001
From: Jonathan Ringer <jonringer117@gmail.com>
Date: Wed, 21 Apr 2021 11:22:49 -0700
Subject: [PATCH] python37Packages.poetry-core: fix build for python<=3.7

---
 pkgs/development/python-modules/poetry-core/default.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/development/python-modules/poetry-core/default.nix b/pkgs/development/python-modules/poetry-core/default.nix
index bec70aacca72..4d8c444dcd20 100644
--- a/pkgs/development/python-modules/poetry-core/default.nix
+++ b/pkgs/development/python-modules/poetry-core/default.nix
@@ -23,6 +23,13 @@ buildPythonPackage rec {
     sha256 = "07x0zagf9cfr7g3132jjd5byywkbnzpfbxjfjzpzpj70fqw70qrc";
   };
 
+  postPatch = lib.optionalString (pythonOlder "3.8") ''
+    # remove >1.0.3
+    substituteInPlace pyproject.toml \
+      --replace 'importlib-metadata = {version = "^1.7.0", python = "~2.7 || >=3.5, <3.8"}' \
+        'importlib-metadata = {version = ">=1.7.0", python = "~2.7 || >=3.5, <3.8"}'
+  '';
+
   nativeBuildInputs = [
     intreehooks
   ];