ref: 51496e8b8d5cae9f74e07f43ad8cc6b893fc7a19 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); }