$ make
Scanning dependencies of target bson_shared
[  1%] Building C object CMakeFiles/bson_shared.dir/src/bson/bcon.c.obj
In file included from C:/Users/vagrant/gittmp/libbson/src/bson/bson.h:23:0,
                 from C:/Users/vagrant/gittmp/libbson/src/bson/bcon.h:24,
                 from C:/Users/vagrant/gittmp/libbson/src/bson/bcon.c:24:
C:/Users/vagrant/gittmp/libbson/src/bson/bson-compat.h:110:9: error: unknown type name 'RTL_RUN_ONCE'
 typedef RTL_RUN_ONCE INIT_ONCE;
         ^
In file included from C:/Users/vagrant/gittmp/libbson/src/bson/bson.h:34:0,
                 from C:/Users/vagrant/gittmp/libbson/src/bson/bcon.h:24,
                 from C:/Users/vagrant/gittmp/libbson/src/bson/bcon.c:24:
C:/Users/vagrant/gittmp/libbson/src/bson/bson-iter.h: In function 'bson_iter_timeval_unsafe':
C:/Users/vagrant/gittmp/libbson/src/bson/bson-iter.h:394:18: error: 'suseconds_t' undeclared (first use in this function)
    tv->tv_sec = (suseconds_t) (value / 1000);
                  ^
C:/Users/vagrant/gittmp/libbson/src/bson/bson-iter.h:394:18: note: each undeclared identifier is reported only once for each function it appears in
CMakeFiles/bson_shared.dir/build.make:54: recipe for target 'CMakeFiles/bson_shared.dir/src/bson/bcon.c.obj' failed
make[2]: *** [CMakeFiles/bson_shared.dir/src/bson/bcon.c.obj] Error 1