[Webkit-unassigned] [Bug 136576] can not find cairo-gl.h when build webkit with gtk on ubuntu 14.04

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=136576

--- Comment #21 from Alberto Garcia <berto at igalia.com> ---
Ok, so the problem here doesn't seem to have anything to do with the
plugin process, but with what I said in comment #17:

We have this code to detect cairo-gl:

     if (CAIRO_GL_FOUND)
         WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_ACCELERATED_2D_CANVAS ON)
     else ()
         WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_ACCELERATED_2D_CANVAS OFF)
     endif ()

If cairo-gl is found then ENABLE_ACCELERATED_2D_CANVAS is ON and
everything builds fine.

If cairo-gl is not found then ENABLE_ACCELERATED_2D_CANVAS is OFF and
everything builds fine as well.

However, the build-webkit script sets ENABLE_ACCELERATED_2D_CANVAS to
ON unconditionally in the GTK port (see FeatureList.pm), and the cmake
code above does not override that setting if cairo-gl is not found.

Hence, WebKit expects to find cairo-gl, which is not present, and the
build fails.

Debian does not ship cairo-gl lately (I don't know about other
distros), that's why this error has popped up recently in my system.

The workaround here is to invoke cmake directly or to pass
--cmakeargs=-DENABLE_ACCELERATED_2D_CANVAS=OFF to build-webkit.

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