I've deleted all the references to linux/config.h, and now I get somes warnings and this error:
/var/abs/local/ipw2200-ap/src/ipw2200-ap-0.3/ipw2200.c: In function 'ipw_wx_get_rate':
/var/abs/local/ipw2200-ap/src/ipw2200-ap-0.3/ipw2200.c:8619: warning: unused variable 'rate'
/var/abs/local/ipw2200-ap/src/ipw2200-ap-0.3/ipw2200.c: In function 'ipw_pci_probe'...
2007-01-23 17:42:44 UTC in IPW2200/2915 AP for Linux