LINUX Fedora Core 4 2.6.17-1.2142_FC4
(Fedora core 6 and 5 should work as well)
For webcam I am using uvcvideo and gspca drivers and luvcview camera utility
If you are using something other than luvcview for image capturing, set env var CAPTURE_APP to your app of choice.
ALL THIS STUFF IS NOT RELIABLE, IT DEPENDS ON HARDWARE AND SOFTWARE INSTALLED AND CAN ONLY BE USED AS ROUGH IDEA
(Note: I think gspca is low level driver and uvcvideo is a module ???? 
I am not sure but probably you don't need uvcvideo for every camera ????? Probably you need something else ?????)
1. select camera from the list, longest list that I found available on http://mxhaard.free.fr/spca5xx.html
- select camera with driver spca5xx or gspcav1 or linux-UVC
(gspcav1 supersede spca5xx and probably linux-UVC???? or linux-UVC also required a uvcvideo module????, anyway I have used cameras with all of the above and they seems to be working)
'NOTE' don't trust camera names, most of them are incorrect, run lsusb with camera connected and use device ID. If we are looking for camera to buy, we can find all device id for our prefered brand, then google them to find actual camera model, for example Logitech Quickcam Family webcam has id 046d:092f, and it is on the list, so it is OK to use this camera even if name is different.
2. check are those drivers already installed and running on your machine: lsmod | grep videodev
If they are not shown, look are they exixst: find /lib/modules/your_current_kernel_version -name gspca\* or uvcvideo\*
If they exist, load them using modprobe -v gspca or uvcvideo
To load them at the boot time insert in /etc/modprobe.conf lines like alias uvcdrv uvcvideo or gspca
3. Downloading or building gspacv driver. If not (likely) download driver from http://atrpms.net/dist/fc6/gspca/
It should have exactly the same version as your kernel, so if uname -r telling:2.6.20-1.2952.fc6 we should use driver gspcav1-kmdl-2.6.20-1.2952.fc6-1.00.18-4.fc6.i686.rpm
4. install driver: rpm -i gspcav1-kmdl-2.6.20-1.2952.fc6-1.00.18-4.fc6.i686.rpm
5. If your can't find driver with exact kernel version you will need to build one. Download it from http://mxhaard.free.fr/download.html or use one from sam:/u2/programs/webcam (link to gspcav on top of the page and uvcvideo and lucvview utility almost at the bottom.
NOTE - always build a driver on the same machine where it will be running or on exact clone with exactly the same kernel version
NOTE - to build a driver or module there should be a kernel-devel installed on your machine and it should have EXACTLY same version
so if rpm -q kernel-devel telling thet you do not have appropriate version, install it using yum install kernel-devel-2.6.20-1.2952.fc6 (DO NOT USE yum instal kernel-devel, most likely it will install WRONG version)
NOTE always build a driver using a user without our CONTROL setting, use postgres or root or ... instead
6. run yum install SDL and yum install SDL-devel (SDL-devel needed only if you are going to build your own luvcview ???)
7. build uvcvideo module if not found. (cd trunk, make; make install) load it same vay as gspca.
8. install video4linux-kmdl and video4linux and video4linux-devel from http://atrpms.net/dist/fc6/video4linux/ ????? not sure, probably don't need it???? install v4l-conf and v4l-tools ?????
IF YOUR HAVE TRIED ALL OF THE ABOVE AND IT STILL DOES NOR WORK --- GOOGLE OR FORGET ABOUT IT ;-(