The downloads available on:

[http://www.fossil-scm.org/download.html]

are for Mac OS X 10.5/10.6 intel only.  Please build a universal binary that works with Mac OS X 10.4+.  If the 10.4 SDK is installed (should be installed by default with the 10.5 developer tools -- it may be an optional install with the 10.6 tools) into the normal default location of <tt>/Developer/SDKs/MacOSX10.4u.sdk</tt> then simply using this command:

<pre>
make \
  CFLAGS='-arch i386 -arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk -mmacosx-version-min=10.4' \
  LDFLAGS='-arch i386 -arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk -mmacosx-version-min=10.4'
</pre>

instead of just "<tt>make</tt>" in the fossil source checkout will produce a universal binary that runs on 10.4 or later on PowerPC or Intel machines.  (Of course it doesn't hurt to run <tt>strip</tt> on the final <tt>fossil</tt> file produced either.)

There are still a lot of PowerPC machines out there (and a fair number of 10.4 ppc machines -- that's the last version of Mac OS X that will run classic apps) and this change is a relatively painless thing to do to support more platforms and make fossil accessible to more folks who are unwilling (or unable) to build from sources themselves on Mac OS X.

I have verified that the universal binary fossil executable built this way runs successfully on these platforms:
<ul>
<li>10.4 PowerPC G4
<li>10.5 PowerPC G5
<li>10.5 Intel x86_64
<li>10.6 Intel x86_64
</ul>
and so believe there are no problems with the universal binary produced this way.