ref: 5fd2e746e1a2a00d2acbc0c3b1924b1ea22101e8 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); }