It's always good to use prepared packages for your distribution. Search in distribution's repositories or in our sourceforge download area.
You can always build your own TOra from source code. See Development section for howto
There are Windows (32bit) binaries available in our sourceforge download area.
Important! Because of legal reasons TOra comes with a stub oci.dll file which makes it possible to use TOra with non Oracle databases even when Oracle client is not installed. If you need to access Oracle - you must install Oracle client (for example oracle instant client) and delete stub oci.dll from TOra installation folder.
Visit Mac dedicated page for more.
TOra can be compiled on every system where is Qt4 and Oracle client available. Probably. Let us know your experiences with it, please.