webkit-gtk 2.0.4 fails to build wth clang

[ralph@…]

The relevant bit of the log is

:info:build clang: warning: argument unused during compilation: '-pthread'
:info:build dyld: Symbol not found: __cg_jpeg_resync_to_restart
:info:build   Referenced from: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
:info:build   Expected in: /opt/local/lib/libjpeg.9.dylib
:info:build  in /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
:info:build Command '['/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_www_webkit-gtk/webkit-gtk/work/webkitgtk-2.0.4/tmp-introspectdqJQIM/WebKit-1.0', '--introspect-dump=/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_www_webkit-gtk/webkit-gtk/work/webkitgtk-2.0.4/tmp-introspectdqJQIM/functions.txt,/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_www_webkit-gtk/webkit-gtk/work/webkitgtk-2.0.4/tmp-introspectdqJQIM/dump.xml']' returned non-zero exit status -5
:info:build make[1]: *** [WebKit-1.0.gir] Error 1

This is using clang from Xcode 5 Developer preview...

[larryv (Lawrence Velázquez)]

1. You are under NDA.
2. Duplicate of #39598.