[Bug 251058] graphics/cairo: cannot build without X11 if mesa-libs was built without PLATFORM_X11

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251058

Jan Beich <jbeich at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|graphics/cairo - "GL/gl.h   |graphics/cairo: cannot
                   |not found"                  |build without X11 if
                   |                            |mesa-libs was built without
                   |                            |PLATFORM_X11

--- Comment #8 from Jan Beich <jbeich at FreeBSD.org> ---
If mesa-libs was built with PLATFORM_X11 disabled then libGL.so won't exist, so
`pkg-config gl` fails. However, the port passes --enable-gl because
--enable-egl cannot be used standalone: needs either GLX (via X11) or GLESV2
but GLESV2 isn't enabled by default.

Without review D25020 fixing this is complicated: both basic OpenGL and X11
extensions are part of the same library. Until then enable GLESV2 instead of
OPENGL. Upstream isn't active nowadays, and most distributions switched to
libglvnd.

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