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-rw-r--r--pkgs/development/python-modules/bootstrapped-pip/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/python-modules/bootstrapped-pip/default.nix b/pkgs/development/python-modules/bootstrapped-pip/default.nix
index 812ff1a64cb6..d2cefade9c44 100644
--- a/pkgs/development/python-modules/bootstrapped-pip/default.nix
+++ b/pkgs/development/python-modules/bootstrapped-pip/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
postPatch = ''
mkdir -p $out/bin
- '' + pip.postPatch;
+ '' + (pip.postPatch or ""); # `pip` does not necessarily have a `postPatch` field.
nativeBuildInputs = [ makeWrapper unzip ];
buildInputs = [ python ];