INSTALL, meson: update a bit installation docs.

Author: Jehan

INSTALL.in

@@ -1,6 +1,6 @@
----------------------------------------
+--------------------------------------
 Installation instructions for GIMP @GIMP_APP_VERSION@
----------------------------------------
+--------------------------------------
 
 There are some basic steps to building and installing GIMP.
 
@@ -103,7 +103,7 @@ help in that regard:
      be installed. All these libraries are required dependencies.
 
   8. For metadata access GIMP requires the gexiv2 @GEXIV2_REQUIRED_VERSION@ or newer library.
-     It is hosted at: https://wiki.gnome.org/Projects/gexiv2
+     It is hosted at: https://gitlab.gnome.org/GNOME/gexiv2/
 
   9. libpng, libjpeg, libtiff, librsvg and lcms are hard dependencies
      that can not be disabled. poppler is also a hard dependency because
@@ -175,7 +175,7 @@ help in that regard:
      For HTTP support (and many other schemes), on Linux at least, you
      should install `gvfs`:
 
-        https://wiki.gnome.org/Projects/gvfs
+        https://gitlab.gnome.org/GNOME/gvfs/
 
      It is unclear whether `gvfs` can be built and installed on other
      platforms such as Windows and macOS.
@@ -345,9 +345,10 @@ These are:
      a convenience for developers.
 
   -Dgimpdir=DIR.  This option changes the default directory GIMP uses to
-     search for its configuration files from ~/.config/GIMP/@GIMP_APP_VERSION@ (the
-     directory .config/GIMP/@GIMP_APP_VERSION@ in the user's home directory) to
-     ~/.config/DIR/@GIMP_APP_VERSION@.
+     search for its configuration files from $XDG_CONFIG_HOME/GIMP/@GIMP_APP_VERSION@/
+     (per XDG Base Directory Specification, $XDG_CONFIG_HOME defaults to
+     the directory .config/ in the user's home directory) to
+     $XDG_CONFIG_HOME/DIR/@GIMP_APP_VERSION@/.
      If DIR is an absolute path, the directory will be changed to DIR.
 
   -Dshmem-type=[none|sysv|posix|win32|auto].  This option allows you to

meson_options.txt

@@ -21,7 +21,7 @@ option('check-update',      type: 'combo', value: 'platform-default',
                             choices: [ 'yes', 'no', 'platform-default' ])
 
 option('bug-report-url',    type: 'string',  value: '',   description: 'URL used by the debug dialog to report bugs')
-option('gimpdir',           type: 'string',  value: '',   description: 'Change default gimpdir from ~/.config/GIMP/2.9 to ~/.config/DIR/2.9 (if relative), or to DIR (if absolute)')
+option('gimpdir',           type: 'string',  value: '',   description: 'Change default gimpdir from ~/.config/GIMP/3.0 to ~/.config/DIR/3.0 (if relative), or to DIR (if absolute)')
 option('icc-directory',     type: 'string',  value: '',   description: 'Path to default color profiles for this system')
 option('directx-sdk-dir',   type: 'string',  value: '',   description: 'Prefix where the DirectX SDK is installed(optional)')
 option('with-sendmail',     type: 'string',  value: '',   description: 'Use Sendmail instead of Xdg-email')