"builder = builder.clang_arg(\"-cxx-isystem\");

                  builder = builder.clang_arg(\""

                  (assoc-ref inputs "gcc") "/include/c++\");

                  builder = builder.clang_arg(\"-cxx-isystem\");

                  builder = builder.clang_arg(\""

                  (car (find-files (string-append

                                     (assoc-ref inputs "gcc")

                                     "/include/c++")

                                   "-gnu$" #:directories? #t)) "\");

         (add-after 'unpack 'fix-isnan

           (lambda _

             ;; There is a bug preventing SymbolTable_autogen.cpp from finding

             ;; isnan and isinf, although they are defined in that same file.

             ;; The reason seems to be that they are already defined in math.h

             (substitute* "gfx/angle/checkout/src/compiler/translator/SymbolTable_autogen.cpp"

			   (("^namespace sh")

				"#undef isnan

#undef isinf

namespace sh"))

             #t))

                     flags))))

         ;; This fixes the file chooser crash that happens with GTK 3.

         (replace 'wrap-program

           (lambda* (#:key inputs outputs #:allow-other-keys)

             (let* ((out (assoc-ref outputs "out"))

                    (lib (string-append out "/lib"))

                    (gtk (assoc-ref inputs "gtk+"))

                    (gtk-share (string-append gtk "/share")))

               (wrap-program (car (find-files lib "^firefox$"))

                 `("XDG_DATA_DIRS" ":" prefix (,gtk-share)))

               #t)))))))