Stricter compatibility checking for GIF dependency

[Adriaan de Groot]

I have a Kubuntu system where I installed the first GIF library I spotted -- 
one called giflib3g. This passes the configure tests and installs 
a /usr/include/gif_lib.h but the library is not compatible with KHTML because 
it is missing GifFileType member UserData. Switching to libungif4 resolves 
that. Can a check for that member variable be added to kdelibs' configure 
checks to ail out before compilation?

-- 
KDE Quality Team
GPG: FEA2 A3FE