Only seems to affect this one box of mine; a fresh Ubuntu 16.04 install on an Atom C2558. This system is otherwise unremarkable, other than being fairly low-powered. Built using both the "build.sh" and "make build" methods, both trigger this issue.

When linking the vnet library this warning is emitted:

{{
/usr/bin/ld: Warning: size of symbol `sr_replicate_node' changed from 112 in vnet/sr/.libs/sr.o to 120 in vnet/sr/.libs/sr_replicate.o
}}

The resulting vpp binary then complains that the sr-replicate node does not exist.

A quick hack to change the sr.h declaration:
{{
-vlib_node_registration_t sr_replicate_node;
+extern vlib_node_registration_t sr_replicate_node;
}}
and commenting out all other extra declarations of it in sr_replicate.c resolves the issue, opening a wider question around this declaration pattern elsewhere.

Keith and I are looking into this.