If you are updating libcurl, I strongly recommend installing it to a non-default prefix (i.e. /opt/curl) and pointing rTorrent to it via its configure flags and/or LD_LIBRARY_PATH; replacing the system libcurl with a newer version is almost always a bad idea (tm). -- Ubuntu MOTU Developer and Forums Council
If you are updating libcurl, I strongly recommend installing it to a non-default prefix (i.e. /opt/curl) and pointing rTorrent to it via its configure flags and/or LD_LIBRARY_PATH; replacing the system libcurl with a newer version is almost always a bad idea (tm).
This is what I do for any unpackaged libraries, it should work fine (and is safer, as mentioned). -- Interested in open source engine management for your Subaru?