Compiling nginx with nginx-gridfs, getting mongo-c-driver errors during make

I'm attempting to compile nginx (version 1.0.11) with gridfs support (nginx-gridfs version 0.8) on Ubuntu 11.10 (gcc version 4.6) using the nginx module here:

https://github.com/mdirolf/nginx-gridfs

The installation instructions described there are simple:

* Clone the nginx-gridfs repository (`git clone https://github.com/mdirolf/nginx-gridfs`)
* Check out the mongo-c-driver submodule (`git submodule init` then `git submodule update`)
* Download and unpack the nginx source (from `http://nginx.org/download/nginx-1.0.11.tar.gz`)
* Run `./configure` with `--add-module=/path/to/nginx-gridfs/repository`
* `make` and `sudo make install`

These steps worked fine for me last time I set up nginx-gridfs on a machine (about four months ago on Ubuntu 10.04, with gcc 4.5 and nginx version 1.0.5), but now (on a fresh Ubuntu install) I'm getting an error. The ./configure is working fine, but make fails with:

/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c: In function 'mongo_count':
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c:939:5: error: missing initializer [-Werror=missing-field-initializers]
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c:939:5: error: (near initialization for 'out.dataSize') [-Werror=missing-field-initializers]
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c: In function 'mongo_simple_int_command':
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c:981:5: error: missing initializer [-Werror=missing-field-initializers]
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c:981:5: error: (near initialization for 'out.dataSize') [-Werror=missing-field-initializers]
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c: In function 'mongo_simple_str_command':
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c:1013:5: error: missing initializer [-Werror=missing-field-initializers]
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c:1013:5: error: (near initialization for 'out.dataSize') [-Werror=missing-field-initializers]
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c: In function 'mongo_cmd_get_error_helper':
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c:1055:5: error: missing initializer [-Werror=missing-field-initializers]
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c:1055:5: error: (near initialization for 'out.dataSize') [-Werror=missing-field-initializers]
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c: In function 'mongo_cmd_ismaster':
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c:1098:5: error: missing initializer [-Werror=missing-field-initializers]
/path/to/nginx-gridfs/mongo-c-driver/src/mongo.c:1098:5: error: (near initialization for 'out.dataSize') [-Werror=missing-field-initializers]
cc1: all warnings being treated as errors
make[1]: *** [objs/addon/src/mongo.o] Error 1

Any idea why this would fail?

The cc1: all warnings being treated as errors leads me to believe that I may be able to add -Wno-error to CFLAGS to tell it not treat warnings as errors to avoid this issue. But I'm worried that treat-warnings-as-errors is enabled here for a reason, and that turning it off would only make the compilation successful on the surface, but not actually work.

Anyone know what's going on here?