stassats noticed that 1- run-program would fail in ECL while under SLIME, because ECL's system simultaneously insists in redirecting the I/O to current Lisp streams, and fails if they are not fd streams. 2- the current run-program is so tight a knot as to be horrible and unmaintainable. At the same time, I was procrastinating big time, and feeling I didn't want all that UIOP effort to go to waste. Therefore, 3- I fixed run-program, which involved teaching it about input as well as output, at which point error-output was a breeze. 4- Along the way, I fixed an embarrassing bug in with-temporary-file when using external-format, fixed bugs in slurp-input, identified a CCL bug #1114. 5- run-program is now much cleaner, maybe even maintainable by others, with a somewhat more portable interface to the underlying functionality, and a much improved API for the end-user. 6- Unhappily, 400 lines of code were added (but they include improved documentation). I only tested on Linux x64, using free software implementations and Allegro (Express Edition). Other people will need to test on LispWorks and on Windows, neither of which I can test. It's all committed on the git repository in the run-program topic branch: http://common-lisp.net/gitweb?p=projects/asdf/asdf.git;a=shortlog;h=refs/hea... See the commit message for more details on what changed. It should be mostly compatible for all users (= only inferior-shell and asdf tests, AFAICT). —♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• http://fare.tunes.org You have the capacity to learn from mistakes. You'll learn a lot today.