No additional library is necessary.

Here is the procedure for installing tRNAscan-SE from its source code:

• The archive is downloaded from the web in /home/bioubuntu, decompressed and the newly created folder is moved into /opt/bio/sources.

• This folder should belong to root and its permissions set to 755.

% sudo chown -R root:root /opt/bio/sources/tRNAscan-SE-1.23
% sudo chmod 755 /opt/bio/sources/tRNAscan-SE-1.23

• Once you are in /opt/bio/sources/tRNAscan-SE-1.23, you need to do small edits in the Makefile before compiling:

BINDIR=/usr/local/bin
LIBDIR=/usr/lib/tRNAscan-SE
MANDIR=/usr/share/man

• After that, compilation is a snap:

% cd src
% sudo make && sudo make install