ref: 3a2f6031ed0753e6b47676f7f8c5ea2a99e13b4b 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); }