--- libs/chrono/test/Jamfile.v2.orig	2019-04-09 21:35:24.000000000 +0200
+++ libs/chrono/test/Jamfile.v2	2020-06-30 15:22:03.162305000 +0200
@@ -15,6 +15,7 @@
 project
     : requirements
         <target-os>freebsd:<linkflags>"-lrt"
+        <target-os>bsdsunix:<linkflags>"-lrt"
         <target-os>linux:<linkflags>"-lrt -lpthread"
         <toolset>clang/<target-os>linux:<linkflags>"-lpthread"
         <toolset>pgi:<linkflags>"-lrt"