I'm unsure of the current ASDF work flow for patch submissions, but I guessed that y'all would like [merge requests][57]. Without this patch, Elias' recent work on UIOP/RUN-PROGRAM won't be utilized on any ABCL which is built from development source. ABCL uses the convention that development versions start appending strings separated via #\- characters to the primary value returned by CL:LISP-IMPLEMENTATION-VERSION (e.g. '1.5.0-dev'. Such values cause the UIOP/UTILITY:PARSE-VERSION function to return nil, meaning that this is not a suitable conditional for whether LAUNCH-PROGRAM is invoked. This patch uses the value of UIOP/OS:IMPLEMENTATION-IDENTIFIER to identify version. Unknown whether this would work on MKCL/ECL, which might simplify the code path here. [57]: https://gitlab.common-lisp.net/asdf/asdf/merge_requests/57 Please let me know what I can do to conform to y'alls current style conventions, test coverage, etc. for such a patch submission. This patch is necessary for [my backporting of Elias's work to JDK56][1] [1]: http://abcl.org/trac/ticket/422 -- "A screaming comes across the sky. It has happened before, but there is nothing to compare to it now."