--- libs/chrono/perf/Jamfile.v2.orig	2019-04-09 21:35:24.000000000 +0200
+++ libs/chrono/perf/Jamfile.v2	2020-06-30 15:20:33.250543000 +0200
@@ -14,6 +14,7 @@
 project
     : requirements
         <target-os>freebsd:<linkflags>"-lrt" 
+        <target-os>bsdsunix:<linkflags>"-lrt" 
         <target-os>linux:<linkflags>"-lrt" 
         <toolset>pgi:<linkflags>"-lrt" 
         #<threading>single:<define>BOOST_CHRONO_THREAD_DISABLED