ubuntu/ndiswrapper/Makefile has underspecified dependencies on the generated $(EXPORTS) headers, leading to a race condition when building in parallel. This race is most easily triggered by adding "sleep 10" to the top of ubuntu/ndiswrapper/mkexport.sh and ubuntu/ndiswrapper/mkstubs.sh.
anders@balanced-tree:/tmp/linux-source-2.6.26$ cp /boot/config-2.6.26-2-generic .config
anders@balanced-tree:/tmp/linux-source-2.6.26$ make -j ubuntu/ndiswrapper/
…
ubuntu/ndiswrapper/crt.c:17:25: error: crt_exports.h: No such file or directory
make[1]: *** [ubuntu/ndiswrapper/crt.o] Error 1
ubuntu/ndiswrapper/hal.c:17:25: error: hal_exports.h: No such file or directory
make[1]: *** [ubuntu/ndiswrapper/hal.o] Error 1
ubuntu/ndiswrapper/ndis.c:23:26: error: ndis_exports.h: No such file or directory
make[1]: *** [ubuntu/ndiswrapper/ndis.o] Error 1
ubuntu/ndiswrapper/ntoskernel.c:21:32: error: ntoskernel_exports.h: No such file or directory
make[1]: *** [ubuntu/ndiswrapper/ntoskernel.o] Error 1
ubuntu/ndiswrapper/ntoskernel_io.c:21:35: error: ntoskernel_io_exports.h: No such file or directory
make[1]: *** [ubuntu/ndiswrapper/ntoskernel_io.o] Error 1
ubuntu/ndiswrapper/rtl.c:17:25: error: rtl_exports.h: No such file or directory
make[1]: *** [ubuntu/ndiswrapper/rtl.o] Error 1
ubuntu/ndiswrapper/usb.c:19:25: error: usb_exports.h: No such file or directory
make[1]: *** [ubuntu/ndiswrapper/usb.o] Error 1
…
Also, win2lin_stubs.S might be silently built against an empty win2lin_stubs.h if the latter is being generated at the same time.
Patch: <http://anders.kaseorg.com/pub/patches/ndiswrapper-build-race.patch>
Thanks for the patch, confirming.