Here's the error message: /build/webkit2gtk-2.14.0/Source/WebKit2/UIProcess/gtk/AcceleratedBackingStoreWayland.cpp: In member function 'virtual bool WebKit::AcceleratedBackingStoreWayland::paint(cairo_t*, const WebCore::IntRect&)': /build/webkit2gtk-2.14.0/Source/WebKit2/UIProcess/gtk/AcceleratedBackingStoreWayland.cpp:120:74: error: 'deviceScaleFactor' was not declared in this scope cairo_matrix_init(&transform, 1, 0, 0, -1, 0, textureSize.height() / deviceScaleFactor); ^
This was fixed in r206216