Stricter compatibility checking for GIF dependency

[Paulo Jorge Guedes]

> -----Original Message-----
> From: Adriaan de Groot [mailto:groot at kde.org]
> Sent: quarta-feira, 24 de Maio de 2006 22:27
> To: kde-core-devel at kde.org; kde-buildsystem at kde.org
> Subject: Stricter compatibility checking for GIF dependency
> 
> 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?

The check is failing here with mingw because it can't find the header
"gif_lib.h". 
This doesn't happen with msvc because the gnuwin32 include path is in
the INCLUDE env variable, while on mingw I have it set in the
CMAKE_INCLUDE_PATH. Shouldn't cmake honor that and pass the paths in
CMAKE_INCLUDE_PATH to the TRY_COMPILE command?

Paulo