The following is a template for a PKGBUILD-file.

It is the basis for a programme called makepkg. You can put the file anywhere in your filestructure where you have write access. Then run makepkg in that very folder.

The programme will read the PKGBUILD-file, will download the source, change into a save chroot, compile, install to a subdirectory called pkg and then pack the package with those files. This package can be installed with pacman -U pd-template-version.tar.xz.

If you share your file on Arch User Repository (AUR) every archer on the world can install your externals for example with yaourt.

# Contributor: Your name <your.name at the domain of email dot com> 

pkgname=pd-template
pkgver=version
pkgrel=1
pkgdesc="External for Pure Data. Describe functionality in on sentence."
arch=('i686' 'x86_64')
url="http://your-site.html"
depends=('pd')
license=('GPL2')
groups=('pd-externals')
source=('http://soucre.at/${pkgname}-${pkgver}')

md5sums=('--------------------------------') # generat with makepkg -g >> PKGBUILD

build() {
  cd ${srcdir}/template-version
  make
  make DESTDIR=$startdir/pkg prefix=/usr install
}