Frozen synapse PKGBUILD

pkgname=frozensynapse
pkgver=1
pkgrel=6
pkgdesc="A single player and multiplayer simultaneous-turn-based tactical game. (The Humble Frozen Synapse Bundle)"
url="http://www.frozensynapse.com/"
groups=('humblefsbundle' 'humblebundles')
license=('custom: "commercial"')
arch=('i686' 'x86_64')
optdepends=('lib32-nvidia-utils: If you have nvidia graphics'
'lib32-catalyst-utils: If you have ATI graphics'
'lib32-ati-dri: If you have ATI graphics')
source=(${pkgname}.desktop)
md5sums=('eccdc9f63917fdb761d45c5621853485')

if [[ $CARCH == x86_64 ]]; then
depends=('lib32-glibc' 'lib32-gcc-libs' 'lib32-openal' 'lib32-sdl' 'lib32-mesa')
else
depends=('glibc' 'gcc-libs' 'openal' 'sdl' 'mesa')
fi

_archive="FS_Linux_Latest.run"
_archive_md5="33b7c96e24be877a9c1345f7a016b57b"

build(){
cd ${srcdir}
echo Please just place ${_archive} into $(pwd)/
echo Press Enter to continue
read -a _unused


if [ ! -f ${_fsarchivelocation}${_archive} ]; then
echo "${_fsarchivelocation}${_archive} not found!"
return 1
fi

if ! echo "${_archive_md5} ${_fsarchivelocation}${_archive}" | md5sum -c --quiet; then
echo "Invalid checksum for ${_fsarchivelocation}${_archive}"
return 1
fi
}

package(){

# directories
install -d ${pkgdir}/opt/${pkgname}
cd ${srcdir}
./${_archive} --mode unattended --prefix /$pkgdir/opt/$pkgname/

#fix permissions
find ${pkgdir}/opt/${pkgname} -type d -exec chmod 755 {} \;
find ${pkgdir}/opt/${pkgname} -type f -exec chmod 644 {} \;
chmod 755 ${pkgdir}/opt/${pkgname}/FrozenSynapse

# startup scripts
install -Dd ${pkgdir}/usr/bin
echo \#\!/bin/bash > ${pkgdir}/usr/bin/frozensynapse
echo cd /opt/frozensynapse/ >> ${pkgdir}/usr/bin/frozensynapse
echo ./FrozenSynapse \$@ >> ${pkgdir}/usr/bin/frozensynapse
chmod +x ${pkgdir}/usr/bin/frozensynapse

# desktop entry
install -Dm644 ${srcdir}/${pkgname}.desktop ${pkgdir}/usr/share/applications/${pkgname}.desktop
}