ref: 1f3f4cd06bccbaa68e34a7e5d5008c8e788e5db2 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); }