There's a merged pull request on the void-packages repository

mbuffer: update to 20200929
https://github.com/void-linux/void-packages/pull/26108

Description:
- enhancement: added option --no-direct to disable use of O_DIRECT
- defaults: raised default TCP timeout to 10ms for WAN connections
- fix: leave TCP buffer size untouched if not set
- enhancement: add option to set TCP timeout
- performance optimization: use recv with MSG_WAITALL instead of read
- configure fix: look for objdump also with target prefix
- testing: make sure to use gtar for testing to avoid unexpected failures
- portability: NetBSD compatibility fix
- build enhancement: added dependency calculation for make
- build enhancement: automatic version string generation