Unfortunately, after updating to skalibs-2.10.0.1 (downloaded from https://skarnet.org/software/skalibs/skalibs-2.10.0.1.tar.gz) and recompiling execline (statically linked) the problem persists. I also tried compiling and installing both of them on clean system (no previous versions of skalibs and execline installed before) and "emptyenv -c" still empties the whole environment. Perhaps I'm missing something?
My bad! I lied, skalibs-2.10.0.1 fixes something else. The bugfix for emptyenv -c is in the execline git master, but I haven't cut a release yet. Sorry! I will release versions for execline (and s6, which also has bugfixes) early next week. -- Laurent
