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

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 ?