a problem on wlan-ng

Wed May 10 08:41:57 UTC 2006

[root at localhost linux-wlan-ng-0.2.3]# ./Configure

-------------- Linux WLAN Configuration Script -------------

The default responses are correct for most users.

Build Prism2.x PCMCIA Card Services (_cs) driver? (y/n) [y]: y
Build Prism2 PLX9052 based PCI (_plx) adapter driver? (y/n) [n]: n
Build Prism2.5 native PCI (_pci) driver? (y/n) [n]: n
Build Prism2.5 USB (_usb) driver? (y/n) [n]: n

Linux source directory [/lib/modules/2.6.15-1.2054_FC5/build]:
Linux source tree /lib/modules/2.6.15-1.2054_FC5/build is incomplete or
missing!    See the HOWTO for a list of FTP sites for current kernel
sources.

Configuration failed

And I find a problem."/usr/src/kernels/2.6.15-1.2054_FC5-i686" doesn't exist
in my system--fedora core 5.  I sure I didn't delete it myself.

would you please tell me WHY?
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