Install TrueCrypt 6.1a in Slackware 12

1. Download truecrypt source from www.truecrypt.org and expand it in a temporary folder. (opt/truecrypt)

2. Ftp the files below from ftp.rsasecurity.com/pub/pkcs/pkcs-11/v2-20 and copy them into the truecrypt source directory.
/opt/truecrypt/truecrypt-6.1a-source in my case.

cryptoki.h
ct-kip.h
opt-pkcs11.h
pkcs-11v2-20a3.h
pkcs-11v2-20a3d3.h
pkcs11.h
pkcs11f.h
pkcs11t-consolidated-d1.h
pkcs11t.h
pkcs11t.h.org

3. Download wxWidgets from: http://www.wxwidgets.org/downloads/ wxAll is what you want.

4. unpack wxWidgets in the truecrypt source directory.

5. run the following command from the truecrypt source directory /opt/truecrypt/truecrypt-6.1a-source# make NOGUI=1 WX_ROOT=/opt/truecrypt/truecrypt-6.1a-source/wxWidgets-2.8.10 wxbuild

Note: change directories to match your installation

6. run the following command: make NOGUI=1 WXSTATIC=1
7. after the compiling is completed, copy the truecrypt file in the Main folder to /usr/bin
8.