If you have any trouble with running Velvet on a Mac or Sparc/Solaris, take a look within the Makefile. You will find towards the top some indications to adjust the compilations to your needs. For Solaris users, you may find it necessary to: - replace src/recycleBin.c file with the one in contrib/solaris - replace line 113 of utility.c from timersub(&tvNow, &tvstart, &tvDiff); to: tvDiff.tv_sec = tvNow.tv_sec - tvStart.tv_sec; tvDiff.tv_usec = 0;