Yes, it's part of the glibc package. Which you have installed.
/sbin/ldconfig is the same program -- it appears that when you su'ed to root, it didn't change your PATH. Root's PATH should contain /sbin, but normal users' PATHs should not. But if you did an /sbin/ldconfig already, then that's not the problem...
But I don't know what it would be...
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