diff --git a/pkgs/applications/kde/kaddressbook.nix b/pkgs/applications/kde/kaddressbook.nix
index 4ab0721de1a..6080ad5db34 100644
--- a/pkgs/applications/kde/kaddressbook.nix
+++ b/pkgs/applications/kde/kaddressbook.nix
@@ -22,6 +22,7 @@ mkDerivation {
     kxmlgui libkdepim libkleo mailcommon pimcommon prison qgpgme qtbase
   ];
   postInstall = ''
+    # added as an include directory by cmake files and fails to compile if it's missing
     mkdir -p "$out/include/KF5"
   '';
 }
diff --git a/pkgs/development/libraries/mimetic/default.nix b/pkgs/development/libraries/mimetic/default.nix
index 839643887c0..5a965c3d7d9 100644
--- a/pkgs/development/libraries/mimetic/default.nix
+++ b/pkgs/development/libraries/mimetic/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
       url = "https://github.com/tat/mimetic/commit/bf84940f9021950c80846e6b1a5f8b0b55991b00.patch";
       sha256 = "sha256-1JW9zPg67BgNsdIjK/jp9j7QMg50eRMz5FsDsbbzBlI=";
     })
-  ] ++ lib.optional stdenv.isAarch64 [ ./narrowing.patch ];
+  ] ++ lib.optional stdenv.isAarch64 ./narrowing.patch;
 
   meta = with lib; {
     description = "MIME handling library";