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-rw-r--r--nixpkgs/pkgs/development/python-modules/pulsar-client/default.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/python-modules/pulsar-client/default.nix b/nixpkgs/pkgs/development/python-modules/pulsar-client/default.nix
index 65ce904eed4b..075fe4b99d84 100644
--- a/nixpkgs/pkgs/development/python-modules/pulsar-client/default.nix
+++ b/nixpkgs/pkgs/development/python-modules/pulsar-client/default.nix
@@ -108,7 +108,8 @@ in buildPythonPackage {
 
   format = "wheel";
 
-  src = Srcs."${pythonVersion}-${stdenv.hostPlatform.system}";
+  src = Srcs."${pythonVersion}-${stdenv.hostPlatform.system}"
+    or (throw "Unsupported '${pythonVersion}-${stdenv.hostPlatform.system}' target");
 
   meta = with lib; {
     description = "Client for pulsar";