A new beta of Gambit-C 4.0 is now available in source form at this address: http://www.iro.umontreal.ca/~feeley/gambc4b10.tar.gz Here are the main changes: - all homogeneous vector primitives (u32vector, etc) should now work properly - fixed a few "configure" problems on Mac OS X and Solaris - should build without problems on 64 bit machines (I have only checked on a SUN Ultra-sparc, so if you have access to a 64 bit machine, please report on your success) - interpreter handles procedure calls of up to 4 arguments faster than the general case (5 and more) - implementation of (vector 1 2 3 4) has been improved - I now include the portable "syntax-case" implementation that has been ported to version 4.0 of the Gambit-C interpreter (it is in misc/syntax-case.scm). To use it start gsi like this: gsi misc/syntax-case.scm - You can also rename the file to gambcext.scm and move it to the Gambit installation directory (and even compile it with "gsc -dynamic gambcext.scm" if you wish to speedup macro expansion). Unfortunately, if you use this package all source-code location is lost and debugging will be more difficult. Marc