I've got the same issue.  SMOS v1.3, "GLIBC-2.15 not found".
And yes, at the website you listed, i do see links to various versions of glibc, including 2.15 and never (and older).

For the linux idiots such as myself, would someone kindly point out how, VERY SPECIFICALLY, one would "install" GLIBC from the website above?

Thanks in advance.