Ciao, in an old message I was plain wrong on file modification times and Slackware packages.
It seems that GNU tar (the base of Slackware packaging) preserves by default the file modification times. So the times of FASL files will be more recent than the times of the corresponding .sls files if, when preparing the temporary installation for package building, we give the correct preserve flag to the install command. For GNU install from Coreutils the flag is '-p'. Notice that the "install-sh" script, from the X Consortium or whatever, that is included in GNU Autoconf based packages probably does not support preserving timestamps (this is true for the ones I have seen, for example the one in Ikarus-1661 does not seem to support it).
