ref: d8bcd6c8e4a31a407aebcc3e60cdf3630b0b3c5f 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); }