Updated PKGBUILD for pnmixer-git with automake-1.13

PKGBUILD

# Maintainer: Nick Lanham <[email protected]>
pkgname=pnmixer-git  
pkgver=20130203
pkgrel=1
pkgdesc="PNMixer is a GTK volume mixer applet that runs in the system tray. \
It is lightweight, works with both pulseaudio and alsa, supports mouse wheel \
volume adjustment.
"
arch=('i686' 'x86_64')
license=('GPL')
url="https://github.com/nicklan/pnmixer"
groups=('pnmixer')
depends=('gtk2' 'alsa-lib')
makedepends=('git')
provides=('pnmixer')
conflicts=('pnmixer')

_gitroot="git://github.com/hasufell/pnmixer.git"
_gitname="pnmixer"

build() {
  cd "${srcdir}/"
  msg "Getting git sources"

  if [ -d ${srcdir}/$_gitname ] ; then
    cd $_gitname && git pull origin
    msg "The local files are updated."
  else
    git clone ${_gitroot}
  fi

  msg "Git checkout finished"

  msg "Building package"  

  cd "${srcdir}/${_gitname}"

  autoreconf -fi && intltoolize --copy --force --automake
  ./configure --prefix=/usr
  make
}

package() {
  cd "${srcdir}/${_gitname}"
  make DESTDIR="$pkgdir" install
}

libnotify is a (optional) dependency, toggable by --with-libnotify

If it's not specified, then the configure script will automagically check for libnotify and compile with support if found. The user has an anonymous dependency then which is bad.
Since archlinux is not able to provide build-time configurability for the user I'd say forcing it is the best way.