--- libs/multiprecision/performance/Jamfile.v2.orig	2019-04-09 21:36:11.000000000 +0200
+++ libs/multiprecision/performance/Jamfile.v2	2020-06-30 15:18:33.113239000 +0200
@@ -13,6 +13,7 @@
 
 project : requirements 
    <target-os>freebsd:<linkflags>"-lrt" 
+   <target-os>bsdsunix:<linkflags>"-lrt" 
    <target-os>linux:<linkflags>"-lrt" 
    <toolset>pgi:<linkflags>"-lrt" 
    <include>$(gmp_path)