Someone brought to my attention that notifications don't seem to work with 
Profanity so I decided to look at the pkg build:

# Template file for 'profanity'
  2 pkgname=profanity
  3 version=0.4.5
  4 revision=1
  5 # Package build options
  6 build_options="notify xscreensaver"
  7 build_style=gnu-configure
  8 configure_args="$(vopt_enable notify notifications) $(vopt_with 
xscreensaver)"
  9 hostmakedepends="pkg-config"
 10 makedepends="glib-devel expat-devel ncurses-devel libgcrypt-devel 
libotr-devel
 11  libcurl-devel libstrophe-devel $(vopt_if notifications libnotify-devel)
 12  $(vopt_if xscreensaver libXScrnSaver-devel)"
 13 short_desc="A console based XMPP client"
 14 <email deleted due to being placed on google.
 15 license="GPL-3"
 16 homepage="http://www.profanity.im/"
 17 distfiles="http://www.profanity.im/${pkgname}-${version}.tar.gz"
 18 
checksum=7436b38d03da0645f5cdb3ca3921b974a760ba68fa92e4def82519d759c7fc63

So I'm looking at the "vopt" commands and trying to wrap my head around it.

The best I can tell is that "vopt" makes it easier to select a build option 
if I want to compile the package myself.
so... ./xbps-src -o "notify profanity" followed by "./xbps-src pkg 
profanity" will build it with notify support correct?

Furthermore doing a "./xbps-src show-options foo" show both notify and 
xscreensaver to be off.  Looking at "$(vopt_enable notify notifications", 
does this mean (pseudo code) "if enabled then notifications"?  Reading from 
the manual the enable should mean that build option "notify" is enabled by 
default, or perhaps I misunderstand and, as I wrote above, it actually 
means "if enabled then do this enable-<flag>"

If someone can clear this up in my head I'd appreciate it.