Not sure why, because flatpak-builder used to compile webkitgtk just
fine, but not anymore. I get now a "call of overloaded ‘abs(gdouble)’ is
ambiguous" error. It looks like some header may have been updated in the
flatpak environment and causing multiple abs definitions. Using fabs()
instead works around the issue.
The build has been fixed by a patch from Upstream:
https://bugs.webkit.org/show_bug.cgi?id=156510
Note that WebKit takes hours to build, so if you just want to test
Flatpak, you may prefer disable this module again.
We now have a full-feature Flatpak build, except for libgudev, which
means that special input devices probably won't work in the GIMP
Flatpak. It is to be noted that Flatpak developers told me that
libudev won't work inside the sandbox anyway. A portal will have
to be implemented. See:
https://github.com/flatpak/flatpak/issues/12#issuecomment-276016074
