In case you want to use the Truecrypt 7.1a version on your Pi, follow these steps:
sudo apt-get -y install libfuse-dev tar
wget "https://github.com/AuditProject/truecrypt-verified-mirror/raw/master/Source/TrueCrypt%207.1a%20Source.tar.gz"
tar xfz "TrueCrypt 7.1a Source.tar.gz"
cd truecrypt-7.1a-source
wget ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-11/v2-20/*.h
wget https://freefr.dl.sourceforge.net/project/wxwindows/2.8.12/wxWidgets-2.8.12.tar.gz
tar xfz wxWidgets-2.8.12.tar.gz
make NOGUI=1 WX_ROOT=~/truecrypt-7.1a-source/wxWidgets-2.8.12 wxbuild
make NOGUI=1 WXSTATIC=1
sudo cp Main/truecrypt /usr/local/bin/
sudo chmod +x /usr/local/bin/truecrypt
cd ..
rm -rf truecrypt-7.1a-source/
rm TrueCrypt\ 7.1a\ Source.tar.gz
truecrypt --version
Original post: https://lava-block.com/how-to-compile-truecrypt-7-1a-on-raspberry-pi/