[gtk/render-node-types: 73/75] Do not install GSK headers for missing backends

[Emmanuele Bassi <ebassi src gnome org>]

commit cd5cded430c37fcb57d0ecc03f8fdf2fdbe12c54
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Apr 8 15:30:46 2020 +0100

    Do not install GSK headers for missing backends
    
    Broadway and Vulkan renderers are optional; if GTK hasn't been built
    with their GSK renderers, we should not install their headers.

 gsk/meson.build | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)
---
diff --git a/gsk/meson.build b/gsk/meson.build
index 8aeae9e7e8..0b1d0d7b3f 100644
--- a/gsk/meson.build
+++ b/gsk/meson.build
@@ -60,6 +60,7 @@ gsk_public_headers = files([
 ])
 install_headers(gsk_public_headers, 'gsk.h', subdir: 'gtk-4.0/gsk')
 
+
 gsk_public_gl_headers = files([
   'gl/gskglrenderer.h'
 ])
@@ -69,14 +70,20 @@ gsk_public_headers += gsk_public_gl_headers
 gsk_public_broadway_headers = files([
   'broadway/gskbroadwayrenderer.h'
 ])
-install_headers(gsk_public_broadway_headers, subdir: 'gtk-4.0/gsk/broadway')
-gsk_public_headers += gsk_public_broadway_headers
+
+if get_variable('broadway_enabled')
+  install_headers(gsk_public_broadway_headers, subdir: 'gtk-4.0/gsk/broadway')
+  gsk_public_headers += gsk_public_broadway_headers
+endif
 
 gsk_public_vulkan_headers = files([
   'vulkan/gskvulkanrenderer.h'
 ])
-install_headers(gsk_public_vulkan_headers, subdir: 'gtk-4.0/gsk/vulkan')
-gsk_public_headers += gsk_public_vulkan_headers
+
+if have_vulkan
+  install_headers(gsk_public_vulkan_headers, subdir: 'gtk-4.0/gsk/vulkan')
+  gsk_public_headers += gsk_public_vulkan_headers
+endif
 
 gsk_private_vulkan_shaders = []
 # This is an odd split because we use configure_file() below to workaround