gnu: Make $XDG_DATA_DIRS a search path variable for GLib.

* gnu/packages/glib.scm (glib): Add 'native-search-paths' and
  'search-paths' fields.
* gnu/packages/gnome.scm (libpeas): Remove 'arguments' field.
  (librsvg)[arguments]: Remove #:modules and #:imported-modules.
  Remove settings of INTROSPECTION_SCANNER_ARGS and
  INTROSPECTION_COMPILER_ARGS in makefiles.
* gnu/packages/gtk.scm (gtk+): Likewise.

gnu/packages/glib.scm

@@ -160,6 +160,17 @@ shared NFS home directories.")
       ;; In 'gio/tests', 'gdbus-test-codegen-generated.h' is #included in a
       ;; file that gets compiled possibly before it has been fully generated.
       #:parallel-tests? #f))
+
+   (native-search-paths
+    ;; This variable is not really "owned" by GLib, but several related
+    ;; packages refer to it: gobject-introspection's tools use it as a search
+    ;; path for .gir files, and it's also a search path for schemas produced
+    ;; by 'glib-compile-schemas'.
+    (list (search-path-specification
+           (variable "XDG_DATA_DIRS")
+           (directories '("share")))))
+   (search-paths native-search-paths)
+
    (synopsis "Thread-safe general utility library; basis of GTK+ and GNOME")
    (description
     "GLib provides data structure handling for C, portability wrappers,

gnu/packages/gnome.scm

@@ -424,36 +424,6 @@ some form of information without getting in the user's way.")
        (base32
         "13fzyzv6c0cfdj83z1s16lv8k997wpnzyzr0wfwcfkcmvz64g1q0"))))
     (build-system gnu-build-system)
-    (arguments
-     `(#:modules ((guix build gnome)
-                  (guix build gnu-build-system)
-                  (guix build utils))
-       #:imported-modules ((guix build gnome)
-                           (guix build gnu-build-system)
-                           (guix build utils))
-       #:phases
-        (alist-replace
-         'configure
-         (lambda* (#:key inputs #:allow-other-keys #:rest args)
-          (let ((configure (assoc-ref %standard-phases 'configure)))
-           (substitute* "libpeas-gtk/Makefile.in"
-            (("--add-include-path")
-             (string-append
-               " --add-include-path=" (gir-directory inputs "atk")
-               " --add-include-path=" (gir-directory inputs "gdk-pixbuf")
-               " --add-include-path=" (gir-directory inputs "gtk+")
-               " --add-include-path=" (gir-directory inputs "pango")
-               " --add-include-path")))
-           (substitute* "libpeas-gtk/Makefile.in"
-            (("--includedir=\\$\\(top_builddir")
-             (string-append
-              " --includedir=" (gir-directory inputs "atk")
-              " --includedir=" (gir-directory inputs "gdk-pixbuf")
-              " --includedir=" (gir-directory inputs "gtk+")
-              " --includedir=" (gir-directory inputs "pango")
-              " --includedir=$(top_builddir")))
-           (apply configure args)))
-         %standard-phases)))
     (inputs
      `(("atk" ,atk)
        ("gdk-pixbuf" ,gdk-pixbuf)
@@ -605,28 +575,10 @@ dealing with different structured file formats.")
                 "071959yjb2i1bja7ciy4bmpnd6fn2is9jjqsvvvnsqwl69j9n128"))))
     (build-system gnu-build-system)
     (arguments
-     `(#:modules ((guix build gnome)
-                  (guix build gnu-build-system)
-                  (guix build utils))
-       #:imported-modules ((guix build gnome)
-                           (guix build gnu-build-system)
-                           (guix build utils))
-       #:phases
+     `(#:phases
        (alist-cons-before
         'configure 'augment-gir-search-path
         (lambda* (#:key inputs #:allow-other-keys)
-          (substitute* (find-files "." "Makefile\\.in")
-            (("INTROSPECTION_SCANNER_ARGS = ")
-             (string-append "INTROSPECTION_SCANNER_ARGS = "
-                            "--add-include-path="
-                            (gir-directory inputs "gdk-pixbuf")
-                            " "))
-            (("INTROSPECTION_COMPILER_ARGS = ")
-             (string-append "INTROSPECTION_COMPILER_ARGS = "
-                            "--includedir="
-                            (gir-directory inputs "gdk-pixbuf")
-                            " ")))
-
           (substitute* "gdk-pixbuf-loader/Makefile.in"
             ;; By default the gdk-pixbuf loader is installed under
             ;; gdk-pixbuf's prefix.  Work around that.

gnu/packages/gtk.scm

@@ -375,13 +375,7 @@ application suites.")
       ("python-wrapper" ,python-wrapper)
       ("xorg-server" ,xorg-server)))
    (arguments
-    `(#:modules ((guix build gnome)
-                 (guix build gnu-build-system)
-                 (guix build utils))
-      #:imported-modules ((guix build gnome)
-                          (guix build gnu-build-system)
-                          (guix build utils))
-      #:phases
+    `(#:phases
       (alist-replace
        'configure
        (lambda* (#:key inputs #:allow-other-keys #:rest args)
@@ -392,32 +386,8 @@ application suites.")
            ;; directory.
            ;; See the manual page for dbus-uuidgen to correct this issue.
            (substitute* "testsuite/Makefile.in"
-            (("SUBDIRS = gdk gtk a11y css reftests") "SUBDIRS = gdk"))
-
-	   ;; We need to tell GIR where it can find some of the required .gir
-           ;; files.
-           (substitute* "gdk/Makefile.in"
-            (("--add-include-path=../gdk")
-             (string-append
-              "--add-include-path=../gdk"
-              " --add-include-path=" (gir-directory inputs "gdk-pixbuf")
-              " --add-include-path=" (gir-directory inputs "pango")))
-            (("--includedir=\\.")
-             (string-append "--includedir=."
-              " --includedir=" (gir-directory inputs "gdk-pixbuf")
-              " --includedir=" (gir-directory inputs "pango"))))
-
-           (substitute* "gtk/Makefile.in"
-            (("--add-include-path=../gdk")
-             (string-append "--add-include-path=../gdk"
-              " --add-include-path=" (gir-directory inputs "atk")
-              " --add-include-path=" (gir-directory inputs "gdk-pixbuf")
-              " --add-include-path=" (gir-directory inputs "pango")))
-            (("--includedir=../gdk")
-             (string-append "--includedir=../gdk"
-              " --includedir=" (gir-directory inputs "atk")
-              " --includedir=" (gir-directory inputs "gdk-pixbuf")
-              " --includedir=" (gir-directory inputs "pango"))))
+             (("SUBDIRS = gdk gtk a11y css reftests")
+              "SUBDIRS = gdk"))
            (apply configure args)))
        %standard-phases)))))