diff --git a/pkgs/development/interpreters/femtolisp/default.nix b/pkgs/development/interpreters/femtolisp/default.nix
index 06a4f635b3a6..ecd3bc1f8fd7 100644
--- a/pkgs/development/interpreters/femtolisp/default.nix
+++ b/pkgs/development/interpreters/femtolisp/default.nix
@@ -36,5 +36,6 @@ stdenv.mkDerivation {
     maintainers = with lib.maintainers; [ moody ];
     broken = stdenv.isDarwin;
     platforms = lib.platforms.unix;
+    mainProgram = "flisp";
   };
 }
diff --git a/pkgs/tools/admin/drawterm/default.nix b/pkgs/tools/admin/drawterm/default.nix
index 1a96f3bcfbe4..b5b6a1fb32f3 100644
--- a/pkgs/tools/admin/drawterm/default.nix
+++ b/pkgs/tools/admin/drawterm/default.nix
@@ -64,5 +64,6 @@ stdenv.mkDerivation {
     license = licenses.mit;
     maintainers = with maintainers; [ luc65r moody ];
     platforms = platforms.linux;
+    mainProgram = "drawterm";
   };
 }
diff --git a/pkgs/tools/misc/pc/default.nix b/pkgs/tools/misc/pc/default.nix
index ecf0122f0869..6e9c23ee6d8a 100644
--- a/pkgs/tools/misc/pc/default.nix
+++ b/pkgs/tools/misc/pc/default.nix
@@ -31,5 +31,6 @@ stdenv.mkDerivation (finalAttrs: {
     license = with lib.licenses; [ mit ];
     maintainers = with lib.maintainers; [ moody ];
     platforms = lib.platforms.unix;
+    mainProgram = "pc";
   };
 })