Node v4.x.y binaries have been built with compilers at versions greater than the ones used to build packages in the LTS pkgsrc repositories. They've been built with gcc 4.9 and gcc 4.8, when the compiler used to build packages from the 2014Q4 pkgsrc repository is gcc 4.7.3.
As a consequence, these node v4.x.y binaries downloaded from nodejs.org have