[2018/08/24 16:04:56.526] /usr/bin/gmake
 [2018/08/24 16:04:56.526] ../../../../ext/bson/bson_native.c: In function ‘rb_bson_byte_buffer_put_byte’:
 [2018/08/24 16:04:56.526] ../../../../ext/bson/bson_native.c:766:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
 [2018/08/24 16:04:56.526]    byte_buffer_t *b;
 [2018/08/24 16:04:56.526]    ^
 [2018/08/24 16:04:56.527] ../../../../ext/bson/bson_native.c: In function ‘rb_bson_byte_buffer_put_bytes’:
 [2018/08/24 16:04:56.527] ../../../../ext/bson/bson_native.c:792:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
 [2018/08/24 16:04:56.527]    byte_buffer_t *b;
 [2018/08/24 16:04:56.527]    ^
 [2018/08/24 16:04:56.529] In file included from ../../../../ext/bson/bson_native.c:21:0:
 [2018/08/24 16:04:56.529] ../../../../ext/bson/bson_native.c: At top level:
 [2018/08/24 16:04:56.529] ../../../../ext/bson/native-endian.h:124:17: warning: ‘__bson_uint16_swap_slow’ defined but not used [-Wunused-function]
 [2018/08/24 16:04:56.529]  static uint16_t __bson_uint16_swap_slow(uint16_t v)
 [2018/08/24 16:04:56.529]                  ^
 [2018/08/24 16:04:56.529] ../../../../ext/bson/native-endian.h:145:17: warning: ‘__bson_uint32_swap_slow’ defined but not used [-Wunused-function]
 [2018/08/24 16:04:56.529]  static uint32_t __bson_uint32_swap_slow(uint32_t v)
 [2018/08/24 16:04:56.529]                  ^
 [2018/08/24 16:04:56.529] ../../../../ext/bson/native-endian.h:169:17: warning: ‘__bson_uint64_swap_slow’ defined but not used [-Wunused-function]
 [2018/08/24 16:04:56.529]  static uint64_t __bson_uint64_swap_slow(uint64_t v)
 [2018/08/24 16:04:56.529]                  ^
 [2018/08/24 16:04:56.968] cc1: warning: unrecognized command line option "-Wno-self-assign" [enabled by default]
 [2018/08/24 16:04:56.968] cc1: warning: unrecognized command line option "-Wno-constant-logical-operand" [enabled by default]
 [2018/08/24 16:04:56.968] cc1: warning: unrecognized command line option "-Wno-parentheses-equality" [enabled by default]
 [2018/08/24 16:04:56.968] cc1: warning: unrecognized command line option "-Wno-tautological-compare" [enabled by default]