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-rw-r--r--pkgs/applications/science/logic/isabelle/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/science/logic/isabelle/default.nix b/pkgs/applications/science/logic/isabelle/default.nix
index 7cfe5f92736..4a268cac645 100644
--- a/pkgs/applications/science/logic/isabelle/default.nix
+++ b/pkgs/applications/science/logic/isabelle/default.nix
@@ -41,7 +41,7 @@ stdenv.mkDerivation {
   '';
 
   installPhase = ''
-    ensureDir $out/bin
+    mkdir -p $out/bin
     mv $TMP/$name $out
     cd $out/$name
     bin/isabelle install -p $out/bin