diff --git a/pkgs/desktops/xfce/applications/xfce4-terminal/default.nix b/pkgs/desktops/xfce/applications/xfce4-terminal/default.nix
index ac1d8f96ea39..a9d87d4f6847 100644
--- a/pkgs/desktops/xfce/applications/xfce4-terminal/default.nix
+++ b/pkgs/desktops/xfce/applications/xfce4-terminal/default.nix
@@ -44,5 +44,6 @@ mkXfceDerivation {
   meta = with lib; {
     description = "A modern terminal emulator";
     maintainers = with maintainers; [ ] ++ teams.xfce.members;
+    mainProgram = "xfce4-terminal";
   };
 }
diff --git a/pkgs/tools/X11/xdragon/default.nix b/pkgs/tools/X11/xdragon/default.nix
index 7061a8f0a1cf..9f12a78e2936 100644
--- a/pkgs/tools/X11/xdragon/default.nix
+++ b/pkgs/tools/X11/xdragon/default.nix
@@ -1,14 +1,14 @@
 { lib, stdenv, fetchFromGitHub, pkg-config, gtk3 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "xdragon";
   version = "1.2.0";
 
   src = fetchFromGitHub {
     owner = "mwh";
     repo = "dragon";
-    rev = "v${version}";
-    sha256 = "sha256-wqG6idlVvdN+sPwYgWu3UL0la5ssvymZibiak3KeV7M=";
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-wqG6idlVvdN+sPwYgWu3UL0la5ssvymZibiak3KeV7M=";
   };
 
   nativeBuildInputs = [ pkg-config ];
@@ -24,5 +24,6 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/mwh/dragon";
     license = licenses.gpl3;
     maintainers = with maintainers; [ das_j ];
+    mainProgram = "xdragon";
   };
-}
+})
diff --git a/pkgs/tools/text/hck/default.nix b/pkgs/tools/text/hck/default.nix
index 0467894b116a..782d746398a1 100644
--- a/pkgs/tools/text/hck/default.nix
+++ b/pkgs/tools/text/hck/default.nix
@@ -12,10 +12,10 @@ rustPlatform.buildRustPackage rec {
     owner = "sstadick";
     repo = pname;
     rev = "v${version}";
-    sha256 = "sha256-KPpvai7+El2JA97EXDCstZ66FeyVCe7w+ERDDNRZ/h8=";
+    hash = "sha256-KPpvai7+El2JA97EXDCstZ66FeyVCe7w+ERDDNRZ/h8=";
   };
 
-  cargoSha256 = "sha256-TpwUO0BL8kambnxAUE9+l6YYkNL1WzmkTYn1YxjufdY=";
+  cargoHash = "sha256-TpwUO0BL8kambnxAUE9+l6YYkNL1WzmkTYn1YxjufdY=";
 
   nativeBuildInputs = [ cmake ];
 
@@ -25,5 +25,6 @@ rustPlatform.buildRustPackage rec {
     changelog = "https://github.com/sstadick/hck/blob/v${version}/CHANGELOG.md";
     license = with licenses; [ mit /* or */ unlicense ];
     maintainers = with maintainers; [ figsoda ];
+    mainProgram = "hck";
   };
 }