[gtk/ebassi/for-master] build: Install the API references

[Emmanuele Bassi <ebassi src gnome org>]

commit 7c29847fbf0922c4615615ca821410590ab5abe6
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Mar 12 11:13:54 2021 +0000

    build: Install the API references
    
    We are building them, but not installing them.

 docs/reference/gdk/meson.build |  6 ++++++
 docs/reference/gsk/meson.build |  2 ++
 docs/reference/gtk/meson.build |  2 ++
 docs/reference/meson.build     | 21 ++-------------------
 4 files changed, 12 insertions(+), 19 deletions(-)
---
diff --git a/docs/reference/gdk/meson.build b/docs/reference/gdk/meson.build
index 66b0d150fc..3dc7a0ff92 100644
--- a/docs/reference/gdk/meson.build
+++ b/docs/reference/gdk/meson.build
@@ -22,6 +22,8 @@ if get_option('gtk_doc')
     ],
     depend_files: [ expand_content_md_files ],
     build_by_default: true,
+    install: true,
+    install_dir: docs_dir,
   )
 
   if x11_enabled
@@ -42,6 +44,8 @@ if get_option('gtk_doc')
       depends: [ gdk_gir[0] ],
       depend_files: [ ],
       build_by_default: true,
+      install: true,
+      install_dir: docs_dir,
     )
   endif
 
@@ -63,6 +67,8 @@ if get_option('gtk_doc')
       depends: [ gdk_gir[0] ],
       depend_files: [ ],
       build_by_default: true,
+      install: true,
+      install_dir: docs_dir,
     )
   endif
 endif
diff --git a/docs/reference/gsk/meson.build b/docs/reference/gsk/meson.build
index 1e34799280..f482f9fd6f 100644
--- a/docs/reference/gsk/meson.build
+++ b/docs/reference/gsk/meson.build
@@ -18,5 +18,7 @@ if get_option('gtk_doc')
     depends: [ gdk_gir[0] ],
     depend_files: [ expand_content_md_files ],
     build_by_default: true,
+    install: true,
+    install_dir: docs_dir,
   )
 endif
diff --git a/docs/reference/gtk/meson.build b/docs/reference/gtk/meson.build
index 38db6dd353..c1791edd53 100644
--- a/docs/reference/gtk/meson.build
+++ b/docs/reference/gtk/meson.build
@@ -47,6 +47,8 @@ if get_option('gtk_doc')
     depends: [ gdk_gir[0], gsk_gir[0] ],
     depend_files: [ expand_content_md_files ],
     build_by_default: true,
+    install: true,
+    install_dir: docs_dir,
   )
 endif
 
diff --git a/docs/reference/meson.build b/docs/reference/meson.build
index 24d0daadb1..66598f249a 100644
--- a/docs/reference/meson.build
+++ b/docs/reference/meson.build
@@ -1,27 +1,10 @@
-if get_option('gtk_doc')
-  glib_prefix = dependency('glib-2.0').get_variable(pkgconfig: 'prefix', default_value: '/usr')
-  glib_docpath = join_paths(glib_prefix, 'share', 'gtk-doc', 'html')
-
-  cairo_prefix = dependency('cairo-gobject').get_variable(pkgconfig: 'prefix', default_value: '/usr')
-  cairo_docpath = join_paths(cairo_prefix, 'share', 'gtk-doc', 'html', 'cairo')
-
-  gdkpixbuf_prefix = dependency('gdk-pixbuf-2.0').get_variable(pkgconfig: 'prefix', default_value: '/usr')
-  gdkpixbuf_docpath = join_paths(gdkpixbuf_prefix, 'share', 'gtk-doc', 'html', 'gdk-pixbuf')
-
-  docpath = join_paths(gtk_datadir, 'gtk-doc', 'html')
-
-  version_conf = configuration_data()
-  version_conf.set('GTK_VERSION', meson.project_version())
-
-  src_dir_conf = configuration_data()
-  src_dir_conf.set('SRC_DIR', meson.source_root())
-endif
-
 toml_conf = configuration_data()
 toml_conf.set('version', meson.project_version())
 
 gidocgen = find_program('gi-docgen', required: get_option('gtk_doc'))
 
+docs_dir = gtk_datadir / 'doc/gtk4/reference'
+
 subdir('gdk')
 subdir('gsk')
 subdir('gtk')