vagrant@packer-virtualbox-iso:/vagrant$ uname -a
Linux packer-virtualbox-iso 3.2.0-4-amd64 #1 SMP Debian 3.2.57-3 x86_64 GNU/Linux
vagrant@packer-virtualbox-iso:/vagrant$ cat /usr/include/time.h | grep clock_gettime
extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
vagrant@packer-virtualbox-iso:/vagrant$ cat mycode.nim
import posix

var sp = posix.Ttimespec()
discard posix.clock_gettime(0,sp)



vagrant@packer-virtualbox-iso:/vagrant$ ./nimrod-0.9.4/bin/nimrod c -r mycode.nim --passL:"-lrt"
config/nimrod.cfg(37, 2) Hint: added path: '/home/vagrant/.babel/pkgs/' [Path]
Hint: used config file '/vagrant/nimrod-0.9.4/config/nimrod.cfg' [Conf]
Hint: system [Processing]
Hint: mycode [Processing]
Hint: posix [Processing]
Hint: times [Processing]
Hint: strutils [Processing]
Hint: parseutils [Processing]
gcc   -o /vagrant/mycode  /vagrant/nimcache/stdlib_parseutils.o /vagrant/nimcache/stdlib_strutils.o /vagrant/nimcache/stdlib_times.o /vagrant/nimcache/stdlib_posix.o /vagrant/nimcache/stdlib_system.o /vagrant/nimcache/mycode.o  -ldl
/vagrant/nimcache/mycode.o: In function `mycodeInit':
mycode.c:(.text+0x199): undefined reference to `clock_gettime'
collect2: error: ld returned 1 exit status
Error: execution of an external program failed
vagrant@packer-virtualbox-iso:/vagrant$