An updated ncompress package that fixes one bug is now available for Red Hat Enterprise Linux 6.
The ncompress package contains the compress and uncompress file compression and decompression utilities, which are compatible with the original UNIX compress utility (.Z file extensions).
The ncompress utility previously relied on the glibc implementation of the memcpy() function. A recent glibc update optimized memcpy(), which resulted in data corruption in ncompress file compression and decompression. This update replaces memcpy() with the memmove() function and ncompress now works as expected.
All users of ncompress are advised to upgrade to this updated package, which fixes this bug.