edlib: fix build with cmake

pkgs/by-name/ed/edlib/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   cmake,
 }:
 
@@ -16,6 +17,15 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-XejxohLVdBBzpYZ//OpqC1ActmCaZ8tunJyhOYtZmKQ=";
   };
 
+  patches = [
+    # Bump minimum CMake version to 3.20
+    (fetchpatch {
+      name = "bump-cmake-version.patch";
+      url = "https://github.com/Martinsos/edlib/commit/47359e591f3861f12105fa8e72242de64d5597c4.patch?full_index=1";
+      hash = "sha256-Efbv8XYF1jOz6MypIyhfFJGQQt8gTYNZRd+R8ukIf3o=";
+    })
+  ];
+
   nativeBuildInputs = [ cmake ];
 
   doCheck = true;