can't get QT-devel to install (so that I can configure the kernel using xconfig)

[LiquidEyes]

Please can someone help me out with this infuriating problem...

I have downloaded a kernel and I want to configure and build it*. I am following a tutorial in a book and I've stalled at step one. When I run make xconfig I get an error saying I need to install the 'QT development packages'. This is what I've spent the last few hours trying to do, without any luck.

1. I tried downloading and building QT myself by following these instructions**. All fine until I run make ... it chugs away for ages, then I get a bunch of compile errors.

2. I tried typing yum install qt4-devel. Sure enough, it seems to be installing something, and there are no errors... but when it comes to the crunch and I try to run xconfig, I still get the error saying I need to install QT.

I notice that the QT environment variables don't get set by the second method. I could set them manually but I don't know what to set them to (I have no idea where QT-devel has been installed by yum, and I don't know how to find out).

I'm running Fedora Core 5 (2.6.15-1.2054, a clean installation from the CD) and the kernel I've downloaded is 2.6.7. All help welcome! Thanks in advance...


* This, in turn, is so that I can get my wifi working: apparently the driver only likes kernels 2.6.6 and 2.6.7, so I have to downgrade!
** I'm substituting qt-x11-free-3.0.1 with qt-x11-opensource-src-4.2.2, which is the name of the file I downloaded from here. I'm also removing a few of the arguments to configure, which otherwise cause errors.

[LiquidEyes]

(Mods -- if this is the wrong forum, then please move it to the correct one by all means! Thank you.)