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-rw-r--r--nixpkgs/pkgs/development/tools/ocaml/opam/opam-shebangs.patch2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/tools/ocaml/opam/opam-shebangs.patch b/nixpkgs/pkgs/development/tools/ocaml/opam/opam-shebangs.patch
index f74ac84ca6b2..13aa7a895708 100644
--- a/nixpkgs/pkgs/development/tools/ocaml/opam/opam-shebangs.patch
+++ b/nixpkgs/pkgs/development/tools/ocaml/opam/opam-shebangs.patch
@@ -64,7 +64,7 @@ index 00000000..3ea84e2d
 +header() { echo "$1"; }
 +stopNest() { true; }
 +
-+fixupOutputHooks+=('if [ -z "$dontPatchShebangs" -a -e "$prefix" ]; then patchShebangs "$prefix"; fi')
++fixupOutputHooks+=('if [ -z "${dontPatchShebangs-}" -a -e "$prefix" ]; then patchShebangs "$prefix"; fi')
 +
 +patchShebangs() {
 +    local dir="$1"