Diskperf from trunk does not build. It fails with the message:
configure:3822: error: possibly undefined macro: m4_ifval
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
Please add the following change to diskperf:
Committed in revision 6750
Marking as a duplicated of #4699, since that's what it really is.
*** This bug has been marked as a duplicate of bug 4699 ***