[pango: 1/2] Require CoreText for Quartz backend

[Matthias Clasen <matthiasc src gnome org>]

commit 2a87ef3315603e0144e05a954cb1abe21633dd94
Author: Evan Miller <emmiller gmail com>
Date:   Tue Sep 7 21:19:38 2021 -0400

    Require CoreText for Quartz backend
    
    Also fix CoreText detection by including its header. (Older systems have
    CoreText as a private framework.)

 meson.build | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)
---
diff --git a/meson.build b/meson.build
index d37ed8ac..6c6fed7c 100644
--- a/meson.build
+++ b/meson.build
@@ -405,7 +405,7 @@ if xft_dep.found() and fontconfig_dep.found() and freetype_dep.found()
 endif
 
 if host_system == 'darwin'
-  has_core_text = cc.links('''#include <Carbon/Carbon.h>
+  has_core_text = cc.links('''#include <CoreText/CoreText.h>
                               int main (void) {
                                 CTGetCoreTextVersion ();
                                 return 0;
@@ -481,15 +481,14 @@ if ['pkgconfig', 'internal'].contains(cairo_found_type)
       endforeach
     endif
     if dep.found()
-      if b[0] == 'cairo-ft'
-        if build_pangoft2
-          pango_conf.set(b[2], 1)
-          pango_font_backends += b[3]
-        endif
-      else
-        pango_conf.set(b[2], 1)
-        pango_font_backends += b[3]
+      if b[0] == 'cairo-ft' and not build_pangoft2
+        continue
+      endif
+      if b[0] == 'cairo-quartz' and not pango_conf.has('HAVE_CORE_TEXT')
+        continue
       endif
+      pango_conf.set(b[2], 1)
+      pango_font_backends += b[3]
     endif
   endforeach
 
@@ -538,8 +537,12 @@ elif cairo_found_type == 'library'
   foreach header : cairo_headers
     if cc.has_header('cairo-@0@.h'.format(header))
       pango_conf.set('HAVE_CAIRO_@0@'.format(header.underscorify().to_upper()), 1)
-      if header == 'win32' or header == 'quartz'
+      if header == 'win32'
         pango_font_backends += header
+      elif header == 'quartz'
+        if pango_conf.has('HAVE_CORE_TEXT')
+          pango_font_backends += header
+        endif
       else
         pango_cairo_backends += header
       endif