Possible arguments: c6,
      c7
Ports Linux compatibility
      framework.  Specify c6 to depend on
      CentOS 6 packags.  Specify
      c7 to depend on
      CentOS 7 packages.  The available
      packages are:
allegro
alsa-plugins-oss
alsa-plugins-pulseaudio
alsalib
atk
avahi-libs
base
cairo
cups-libs
curl
cyrus-sasl2
dbusglib
dbuslibs
devtools
dri
expat
flac
fontconfig
gdkpixbuf2
gnutls
graphite2
gtk2
harfbuzz
jasper
jbigkit
jpeg
libasyncns
libaudiofile
libelf
libgcrypt
libgfortran
libgpg-error
libmng
libogg
libpciaccess
libsndfile
libsoup
libssh2
libtasn1
libthai
libtheora
libv4l
libvorbis
libxml2
mikmod
naslibs
ncurses-base
nspr
nss
openal
openal-soft
openldap
openmotif
openssl
pango
pixman
png
pulseaudio-libs
qt
qt-x11
qtwebkit
scimlibs
sdl12
sdlimage
sdlmixer
sqlite3
tcl85
tcp_wrappers-libs
tiff
tk85
ucl
xorglibs
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    documentation may be
    sent to <freebsd-questions@FreeBSD.org>.
    Send questions about this document to <freebsd-doc@FreeBSD.org>.