ref: 5c6a03f4f417d00a6d169cfc9c7e6efae17f4e5e dir: /sys/src/ape/lib/ap/plan9/execl.c/
#include <unistd.h> extern char **environ; int execl(const char *name, const char *arg0, ...) { return execve(name, &arg0, environ); }