ref: e3f5a83c3e1c8c7757eaf77ba50dae2ad0ff2ca1 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); }