ref: e1b4c849ae4c7acea2a8a1e9063392c8bcc4fee8 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); }