It's called "rc4" (instead of "rc3") because I accidentally posted an incorrect rc3 tarball on the web site for a short while. Just to avoid any confusion for anyone who may have downloaded that rc3 tarball, I made a correct one and called it "rc4", and then posted it in the usual place:
Changes since 1.6.3rc2:
- Fix mpirun --launch-agent behavior when a prefix is specified.
Thanks to Reuti for identifying the issue.
- Fixed memchecker configury.
- Brought over some compiler warning squashes from the development trunk.
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