23c23
< IUSE="debug kerberos mms-agent ssl static-libs"
---
> IUSE="debug kerberos mms-agent ssl static-libs +system-boost"
48d47
< 	scons_opts+=" --use-system-boost"
54a54,57
> 
>     if use system-boost; then
> 		scons_opts+=" --use-system-boost"
> 	fi