Can you try gcc instead of clang? The last time I've tried to use clang (llvm) included with iOS SDK on SL 10.6.7 to build Racket for iOS was a month ago when I just failed with unexpected link error (I don't know how to fix it rather than turn back to gcc). I've also tried to run DrRacket months before on Lion DP 1 when at that time besides DrRacket a lot of other applications couldnot run. I doubt things will get better for DP 3. Also, have you tried to run prebuilt Racket or DrRacket bundle directly? <div class="gmail_quote">On 7 May 2011 08:22, Elliott Cable <<a href="mailto:me@ell.io">me@ell.io</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> I can’t coerce the latest Racket source, from GitHub, to compile on Lion. I wasn’t sure whether to build as 32-bit or 64-bit, so I tried both. Here’s all of the relevant output, both the stdout from the compilation process and the resultant crash report/core dump: HEAD (@70b0eb8) as 32-bit: <a href="https://gist.github.com/960017" target="_blank">https://gist.github.com/960017</a> HEAD (@70b0eb8) as 64-bit: <a href="https://gist.github.com/960028" target="_blank">https://gist.github.com/960028</a> v5.1.1 release as 32-bit: <a href="https://gist.github.com/960045" target="_blank">https://gist.github.com/960045</a> v5.1.1 release as 64-bit: <a href="https://gist.github.com/960052" target="_blank">https://gist.github.com/960052</a> Any help would be appreciated, I’m excited to start playing with Racket. (-: _________________________________________________ For list-related administrative tasks: <a href="http://lists.racket-lang.org/listinfo/users" target="_blank">http://lists.racket-lang.org/listinfo/users</a></blockquote></div>