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-rw-r--r--nixpkgs/pkgs/development/python-modules/pykdl/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/python-modules/pykdl/default.nix b/nixpkgs/pkgs/development/python-modules/pykdl/default.nix
index 0d7e82be63f3..cc92086747e4 100644
--- a/nixpkgs/pkgs/development/python-modules/pykdl/default.nix
+++ b/nixpkgs/pkgs/development/python-modules/pykdl/default.nix
@@ -4,7 +4,7 @@ toPythonModule (stdenv.mkDerivation {
   pname = "pykdl";
   inherit (orocos-kdl) version src;
 
-  sourceRoot = "source/python_orocos_kdl";
+  sourceRoot = "${orocos-kdl.src.name}/python_orocos_kdl";
 
   # Fix hardcoded installation path
   postPatch = ''