Arch Linux: improvements regarding PKGBUILD in AUR package compton-conf-git

PKGBUILD

# Maintainer: Thomas Nordenmark <t.nordenmark@gmail.com>

_gitname='compton-conf'
pkgname="$_gitname-git"
pkgver=0.1.0.20.gb7de535
pkgrel=1
pkgdesc="Configuration manager for X compositor compton (git-version)"
arch=('i686' 'x86_64')
url="https://github.com/lxde/compton-conf"
license=('GPL2' 'LGPL2.1')
depends=('qt5-base' 'qt5-tools' 'libconfig')
makedepends=('git' 'cmake>=2.8.6')
optdepends=('compton: The actual compositor to configure'
            'compton-git: The actual compositor to configure (git-version)')
conflicts=('compton-conf')
source=("git+https://github.com/lxde/compton-conf.git")
md5sums=("SKIP")

pkgver() {
    cd "${srcdir}/${_gitname}"
    git describe --always | sed "s/-/./g"
}

build() {
  cd "$srcdir/$_gitname"
  cmake -DCMAKE_INSTALL_PREFIX="/usr"
  make
}

package() {
  cd "$srcdir/$_gitname"
  make DESTDIR="$pkgdir/" install
  sed -i 's/LXQt/X-LXQt/g' "compton-conf.desktop"
  install -D -m644 "compton-conf.desktop" "${pkgdir}/usr/share/applications/"
  install -D -m644 "COPYING" "$pkgdir/usr/share/licenses/$_gitname/COPYING"
}