On linux-x86_64, and possibly linux-intel, xace and tace require non-standard libraries. This is something we already know, but there's a twist: one of the libraries is /lib/ld-linux, which loads ELF libraries. Even if we add this to the LD_LIBRARY_PATH, the path to /lib is hard-coded into the compiled binary.

This can be fixed simply by installing ld-linux.so in the /lib directory, but that would mean that anyone installing BIRCH would have to have root privileges and know how to do that.

So to get around this we run xace or tace with a command like

$BIRCH/lib-linux-x86_64/ld-linux.so.2 $BIRCH/bin-$BIRCH_PLATFORM/xace

That needs to be added to lbirchdb, l-gbirchdb and birchdb.

At the same time, there still seem to be some compatibility issues. This is especially a problem on x86_64, which would be trying to read 64-bit binaries from bin-linux-x86_64 when trying to run xace or tace, which are 32-bit programs. The best solution is to create a separate directory called acedb within the lib-linux-x86_64 directory, and add that to the LD_LIBRARY_PATH.

One consequence of this problem is that during a BIRCH install, tace won't run, so the documentation won't get localized.