I must be honest I'm not a noteedit user. Still I have slack/tex/lilypond experience and I've just had a go at installing noteedit. I went to the noteedit website, and found that they have released another two versions! Noteedit 2.7.0 apparently doesn't convert to lilypond 2.2 properly, but this has been fixed in 2.7.1. Then fixed some more in 2.7.2! So 2.7.0 is no good
I've not got a version of noteedit to uninstall, but it looks like the files that could really clash between versions are in /opt/kde/share/apps/noteedit, so remove this entire directory. I recommend sending the whole directory to the trash within KDE. This should get rid of the lot.
Noteedit isn't near as scary as lilypond to compile, but its not a trivial install either. It requires a library called TSE3 but you've presumably already got it if you compiled 2.6.4. In fact, you probably can do ok from here. Slackware users are the best
After unpacking and changing into the 2.7.2 source directory, make sure you run:
./configure --prefix=/opt/kde
Personally I couldn't be bothered installing the TSE3 library it wanted so I did the following instead:
./configure --prefix=/opt/kde --without-libs
You probably won't want to do that, as it restricts the midi capabilities or something. Then run:
make
/bin/su
make install
The make takes a while on my old computer
and it made a lot of warnings, but that doesn't matter. I could run /opt/kde/bin/noteedit. I then put a few notes into noteedit, exported to lilypond format. Then ran lilypond on noteedit's output. Worked
Rob
P.S. please excuse the excessive use of smileys