[jggimi]

There's nothing wrong with your system. You're attempting to compile one of the larger ports, and I'll guess that you're doing so as a user with limited resources. Let's examine your /etc/login.conf file.

For amd64, the default class has:

default:\
    :path=/usr/bin /bin /usr/sbin /sbin /usr/X11R6/bin /usr/local/bin /usr/local/sbin:\
    :umask=022:\
    :datasize-max=512M:\
    :datasize-cur=512M:\
    :maxproc-max=256:\
    :maxproc-cur=128:\
    :openfiles-cur=512:\
    :stacksize-cur=4M:\
    :localcipher=blowfish,6:\
    :ypcipher=old:\
    :tc=auth-defaults:\
    :tc=auth-ftp-defaults:

The staff class has:

staff:\
    :datasize-cur=512M:\
    :datasize-max=infinity:\
    :maxproc-max=512:\
    :maxproc-cur=128:\
    :ignorenologin:\
    :requirehome@:\
    :tc=default:

There is also a daemon class.

Check your userid's class and your shell's ulimit -a (for bourne-based shells) or limit (for C-based shells).