QtOpenGL does not build with mesa >= 7.8

With the recently released mesa-7.8.1 or mesa git master installed, QtOpenGL (current 4.7 branch) does not compile:

In file included from ../../include/QtOpenGL/private/../../../src/opengl/qglpixelbuffer_p.h:65,
from ../../include/QtOpenGL/private/qglpixelbuffer_p.h:2,
from qglpaintdevice.cpp:45:
/usr/include/GL/glx.h:204: error: 'Bool' has not been declared
/usr/include/GL/glx.h:208: error: 'Bool' does not name a type
/usr/include/GL/glx.h:221: error: 'Bool' does not name a type
/usr/include/GL/glx.h:223: error: 'Bool' does not name a type
[...]

It does compile with mesa-7.7, so it must be a missing #include either in current versions of mesa or in Qt itself.