diff --git a/pkgs/development/libraries/pango/default.nix b/pkgs/development/libraries/pango/default.nix
index 6b4332a4d54..f37a6972c25 100644
--- a/pkgs/development/libraries/pango/default.nix
+++ b/pkgs/development/libraries/pango/default.nix
@@ -22,7 +22,8 @@ in stdenv.mkDerivation rec {
   outputs = [ "bin" "dev" "out" ] ++ optional (!stdenv.isDarwin) "devdoc";
 
   nativeBuildInputs = [
-    meson ninja glib
+    meson ninja
+    glib # for glib-mkenum
     pkgconfig gobject-introspection gtk-doc docbook_xsl docbook_xml_dtd_43
   ];
   buildInputs = [
diff --git a/pkgs/development/libraries/webkitgtk/default.nix b/pkgs/development/libraries/webkitgtk/default.nix
index 98259e1b034..4262be2882d 100644
--- a/pkgs/development/libraries/webkitgtk/default.nix
+++ b/pkgs/development/libraries/webkitgtk/default.nix
@@ -98,8 +98,8 @@ stdenv.mkDerivation rec {
     pkgconfig
     python3
     ruby
-    glib
-    wayland
+    glib # for gdbus-codegen
+    wayland # for wayland-scanner
   ];
 
   buildInputs = [