From 780b9ab83da232f4d4cbea67c9edee5ca5b389d6 Mon Sep 17 00:00:00 2001
From: phaer <hello@phaer.org>
Date: Tue, 29 Nov 2022 14:02:50 +0100
Subject: [PATCH] python: make buildRequirements optional

---
 src/subsystems/python/builders/simple-python/default.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/subsystems/python/builders/simple-python/default.nix b/src/subsystems/python/builders/simple-python/default.nix
index e4b08e52..b6c30023 100644
--- a/src/subsystems/python/builders/simple-python/default.nix
+++ b/src/subsystems/python/builders/simple-python/default.nix
@@ -37,6 +37,8 @@
       (src: src.original or src)
       allDependencySources';
 
+    buildRequirements = lib.concatStringsSep " " (subsystemAttrs.buildRequirements or []);
+
     package = produceDerivation defaultPackageName (buildFunc {
       name = defaultPackageName;
       src = getSource defaultPackageName defaultPackageVersion;
@@ -72,7 +74,7 @@
           --no-cache \
           --ignore-installed \
           $pipInstallFlags"
-        ${python}/bin/python -m pip install $pipInstallFlags ${lib.concatStringsSep " " subsystemAttrs.buildRequirements}
+        ${lib.optionalString (buildRequirements != "") "${python}/bin/python -m pip install $pipInstallFlags ${buildRequirements}"}
         ${python}/bin/python -m pip wheel --verbose --no-index --no-deps --no-clean --no-build-isolation --wheel-dir dist .
         ${python}/bin/python -m pip install $pipInstallFlags .\
       '';