gcc -c -o main.o main.c -I. -I /usr/local/include/libbson-1.0 -I /usr/local/include/libmongoc-1.0 -O2 --std=c99 -D_XOPEN_SOURCE -D_GNU_SOURCE
In file included from /usr/local/include/libbson-1.0/bson-compat.h:38:0,
                 from /usr/local/include/libbson-1.0/bson.h:23,
                 from /usr/local/include/libmongoc-1.0/mongoc.h:22,
                 from main.c:11:
/usr/local/include/libbson-1.0/bson-macros.h:212:23: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘__inline__’
#  define BSON_INLINE __inline__
                       ^
/usr/local/include/libbson-1.0/bson-decimal128.h:61:20: note: in expansion of macro ‘BSON_INLINE’
static _Decimal128 BSON_INLINE
                    ^
In file included from /usr/local/include/libbson-1.0/bson.h:33:0,
                 from /usr/local/include/libmongoc-1.0/mongoc.h:22,
                 from main.c:11:
/usr/local/include/libbson-1.0/bson-decimal128.h:71:32: error: unknown type name ‘_Decimal128’
bson_Decimal128_to_decimal128 (_Decimal128        decimal128,