Building The Accelio XioMessenger is built conditionally only, when --enable-xio is provided to configure. Accelio depends on OpenFabrics verbs development headers/libraries. If either the Accelio or OFED development environments are in non-standard locations, include and library paths must be added to both CFLAGS and CXXFLAGS, in the Autotools build as of 1/1/2015. -Matt