[arch-general] Is it a bug ? (device-mapper PKGBUILD)

[nezmer at gmail.com]

Hi ,
I was looking at the device-mapper PKGBUILD . I'm not sure but the last 
line looks problematic :

# fix device-mapper link bug
ln -sf /lib/libdevmapper.so "${pkgdir}/usr/lib/libdevmapper.so" || return 1

What If device-mapper is not yet installed in the system ?
What am I missing ?