How to add SOVERSION to libraft.so?

[GitHuaKuang]

raft is a dependency of our app, when installing the major version of libraft is missing:
Error: Package: daos-server-0.9.0-2.2819.gcdecd456.el7.x86_64 (/daos-server-0.9.0-2.2819.gcdecd456.el7.x86_64)
Requires: libraft.so()(64bit)

The version of libraft.so is missed in this message, it should be: libraft.so.$n

How can we add the raft SOVERSION to it, probably in the Makefile?
.PHONY: shared
shared: $(OBJECTS)
$(CC) $(OBJECTS) $(LDFLAGS) $(CFLAGS) -fPIC $(SHAREDFLAGS) -o $(BUILDDIR)/libraft.$(SHAREDEXT)

Thx.