ref: 2c8f291db2f04b4f87c01fcd3344c8d2fb1f8e89 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); }