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-rw-r--r--pkgs/os-specific/linux/forktty/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/os-specific/linux/forktty/default.nix b/pkgs/os-specific/linux/forktty/default.nix
index 6402b5c69d8..66570bac942 100644
--- a/pkgs/os-specific/linux/forktty/default.nix
+++ b/pkgs/os-specific/linux/forktty/default.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation {
     mkdir -p "$out/bin"
     mkdir -p "$out/share/man/man8"
   '';
-  makeFlags='' prefix="''${out}" manprefix="''${out}/share/" '';
+  makeFlags = [ "prefix=$(out)" "manprefix=$(out)/share/" ];
   meta = {
     inherit (s) version;
     description = ''Tool to detach from controlling TTY and attach to another'';