Try the attached quick hack. I have NO idea if this is okay wrt Debian policies, but it works. :)
diff -urNd ieee80211.orig/driver/Makefile ieee80211/driver/Makefile --- ieee80211.orig/driver/Makefile 2005-07-21 22:03:16.000000000 +0200 +++ ieee80211/driver/Makefile 2005-08-08 13:38:02.000000000 +0200 @@ -101,6 +101,7 @@ KSRC := /lib/modules/$(KVER)/build KMISC := $(DESTDIR)/lib/modules/$(KVER)/net/ieee80211/ KMISC_INC := $(DESTDIR)/lib/modules/$(KVER)/build/include/net/ +IEEE80211_INC := $(DESTDIR)/lib/modules/$(KVER)/include # KSRC_OUTPUT should be overridden if you are using a 2.6 kernel that # has it's output sent elsewhere via KBUILD_OUTPUT= or O=
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