Installation of bson on systems using GCC v15 is not possible.  See attached file:

{{ gem_make.out}}

A telltale signal of this issue is seeing this repeated, with small variations, many times in the output:

error: unknown type name ‘bool’
  578 | static inline bool

note: ‘bool’ is defined in header ‘<stdbool.h>’; this is probably fixable by adding ‘#include <stdbool.h>’ 

This is likely related to an issue Nobu (Ruby's "patch monster") found:

Anyway, -std=c99 flag is nonsense for other than gcc family.
Use append_cflags instead of adding them blindly.

This issue affected other gems as well, and solutions are known:

1. io-event gem:
   1. Fixed one week ago. 
   2. bug report: https://github.com/socketry/io-event/issues/136
   3. bugfix patch (+6 / -6): https://github.com/socketry/io-event/pull/137/commits/d08576119ccd48900850b833fe853f39f3d604b7
2.  ed25519 gem:
   1. Fixed two months ago.
   2. bug report: https://github.com/RubyCrypto/ed25519/issues/44
   3. bugfix patch (+1 / -1): https://github.com/RubyCrypto/ed25519/pull/45/files#diff-805cf1ea9824de19b94dce429b3a3544fd9cb0b3cc278e571776c7d672cc1dfa 
3. jaro_winkler gem:
   1. Fixed 3 weeks ago.
   2. bug report: https://github.com/tonytonyjan/jaro_winkler/issues/61
   3. bugfix patch (+1 / -1):[ https://github.com/tonytonyjan/jaro_winkler/pull/62/files#diff-594397402316a8262174f2dc8159b5a35560516bd3cd355b1bf657a6e0a973ce|https://github.com/tonytonyjan/jaro_winkler/pull/62/files#diff-594397402316a8262174f2dc8159b5a35560516bd3cd355b1bf657a6e0a973ce]
4. Further discussion on the Ruby Lang bug trackcer:
   1. https://bugs.ruby-lang.org/issues/21290
      #61