I have patched the nginx sources with the latest spdy patch:

/usr/src/nginx-1.3.11# patch -p1 < patch.spdy-55_1.3.11.txt

but building the package isn't possible anymore:

dpkg-buildpackage -rfakeroot -uc -b
...
gcc -c -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -I src/core -I src/event -I src/event/modules -I src/os/unix -I objs -I src/http -I src/http/modules \
-o objs/src/http/ngx_http_write_filter_module.o \
src/http/ngx_http_write_filter_module.c
gcc -c -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -I src/core -I src/event -I src/event/modules -I src/os/unix -I objs -I src/http -I src/http/modules \
-o objs/src/http/ngx_http_copy_filter_module.o \
src/http/ngx_http_copy_filter_module.c
gcc -c -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -I src/core -I src/event -I src/event/modules -I src/os/unix -I objs -I src/http -I src/http/modules \
-o objs/src/http/modules/ngx_http_log_module.o \
src/http/modules/ngx_http_log_module.c
gcc -c -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -I src/core -I src/event -I src/event/modules -I src/os/unix -I objs -I src/http -I src/http/modules \
-o objs/src/http/ngx_http_request_body.o \
src/http/ngx_http_request_body.c
src/http/ngx_http_request_body.c: In function 'ngx_http_discard_request_body':
src/http/ngx_http_request_body.c:479:10: error: 'ngx_http_request_t' has no member named 'spdy_stream'
make[3]: *** [objs/src/http/ngx_http_request_body.o] Error 1
make[3]: Leaving directory `/usr/src/nginx-1.3.11'
make[2]: *** [build] Error 2
make[2]: Leaving directory `/usr/src/nginx-1.3.11'
dh_auto_build: make -j1 returned exit code 2
make[1]: *** [override_dh_auto_build] Error 2
make[1]: Leaving directory `/usr/src/nginx-1.3.11'
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2