I got this :
mingw32-gcc -I./include -I../lib/kjs/include -Wall -Werror
-D_DISABLE_TIDENTS -D__3GB__ -D__NTOSKRNL__ -I. -D_SEH_NO_NATIVE_NLG
-I../include -I../w32api/include -pipe -march=i486 -D_M_IX86 -g -c
ke/main.c -o ke/main.o
ke/main.c: In function `InitSystemSharedUserPage':
ke/main.c:266: error: structure has no member named `DosDeviceMap'
make[1]: *** [ke/main.o] Error 1
make[1]: Leaving directory `/home/dave2/ros/reactos/ntoskrnl'
Thanks, David