test ! -d src/madwifi-bsd/net80211 || \
        make -C src/madwifi-bsd/net80211
make[1]: Entering directory `/home/user/Desktop/islsm/src/madwifi-bsd/net80211'
make -C /usr/src/linux SUBDIRS=/home/user/Desktop/islsm/src/madwifi-bsd/net80211 MODVERDIR=/home/user/Desktop/islsm/src/madwifi-bsd/net80211/../symbols  modules
make[2]: Entering directory `/usr/src/linux-2.6.20-gentoo'
  CC [M]  /home/user/Desktop/islsm/src/madwifi-bsd/net80211/if_media.o
/home/user/Desktop/islsm/src/madwifi-bsd/net80211/if_media.c:54:26: error: linux/config.h: No such file or directory
In file included from include/linux/cache.h:4,
                 from include/asm/pda.h:7,
                 from include/asm/thread_info.h:14,
                 from include/linux/thread_info.h:21,
                 from include/linux/preempt.h:9,
                 from include/linux/spinlock.h:49,
                 from include/linux/module.h:9,
                 from /home/user/Desktop/islsm/src/madwifi-bsd/net80211/if_media.c:56:
include/linux/kernel.h:41:1: warning: "roundup" redefined
In file included from <command line>:1:
/home/user/Desktop/islsm/src/madwifi-bsd/net80211/../include/compat.h:46:1: warning: this is the location of the previous definition
make[3]: *** [/home/user/Desktop/islsm/src/madwifi-bsd/net80211/if_media.o] Error 1
make[2]: *** [_module_/home/user/Desktop/islsm/src/madwifi-bsd/net80211] Error 2
make[2]: Leaving directory `/usr/src/linux-2.6.20-gentoo'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/user/Desktop/islsm/src/madwifi-bsd/net80211'
make: *** [madwifi] Error 2