--- libs/log/build/Jamfile.v2.orig	2019-04-09 21:35:55.000000000 +0200
+++ libs/log/build/Jamfile.v2	2020-06-30 15:39:39.804028000 +0200
@@ -237,6 +237,7 @@
         <target-os>hpux:<library>ipv6
 
         <target-os>freebsd:<library>rt
+        <target-os>bsdsunix:<library>rt
         <target-os>qnxnto:<library>socket
         <toolset>pgi:<library>rt
     : usage-requirements