[Ieee80211-devel] ieee80211 (1.2.15) fails to compile because it can't find genksyms (kernel 2.6.15.4)

[Mingyur K. <Mi...@in...>]

i've successfully compiled  ieee80211-1.2.15 with my kernel 2.6.15.4 ,
after i've compiled again the same kernel without changing nothing with
gcc 4.1 (instead of 3.3 slack precompiled),
but when i'm going to make ieee80211-1.2.15 i get this error :

root@darkstar:/opt1/ieee80211-1.2.15# make
Checking in /lib/modules/2.6.15.4 for ieee80211 components...
make -C /lib/modules/2.6.15.4/build M=/opt1/ieee80211-1.2.15 modules
make[1]: Entering directory `/usr/src/linux-2.6.15.4'
  CC [M]  /opt1/ieee80211-1.2.15/ieee80211_module.o

/bin/sh: scripts/genksyms/genksyms: No such file or directory

make[2]: *** [/opt1/ieee80211-1.2.15/ieee80211_module.o] Error 1
make[1]: *** [_module_/opt1/ieee80211-1.2.15] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.15.4'
make: *** [modules] Error 2

how can i do?! 
thx, mingyur