Wandbox: a social compilation service

Wandbox is a project that allows you to try several languages in your browser. Just paste the code and Wandbox will compile/interpret it and show you the result.

Try it here. The source code is on GitHub.

The service can be called via an API too! The API doc. is here: https://github.com/melpon/wandbox/blob/master/kennel/API.rst.

Install Midnight Commander from source

Problem
I’ve already noticed that the Ubuntu repositories are sometimes very out-of-date. A good example for this is the “mc” package. There is a PPA for Midnight Commander that should solve this problem but it’s also very old. At the time of writing (August 10, 2011), the current stable release is 4.7.5.3 while the PPA contains the version 4.7.0.9 (updated on Sept. 15, 2010).

Solution
Since I wanted to use a fresh release of MC, I installed it from source. Steps to follow:

• Download the latest stable source and unpack it.
• For a successful compilation I had to install this package too: “sudo apt-get install libslang2-dev libglib2.0-dev”.
• ./configure
• make
• If it was successful then you should have a binary “mc” file in the src/ folder. If it’s there, you can remove your current version with “sudo apt-get remove mc“.
• Then install the new version with “sudo make install“.

I also had to modify my .bashrc a bit:

# old:
#alias mc='. /usr/share/mc/bin/mc-wrapper.sh'
# new:
alias mc='. /usr/local/libexec/mc/mc-wrapper.sh'

Update (20120505)
Installing mc from source is now integrated in jabbatron.

Convert PDF to EPS

Problem
I wanted to submit a paper but they required the LaTeX source too, including the images. They accepted EPS images but not PDF! WTF? All my images are in PDF format. How to convert them to EPS?

Solution

pdftops -eps file.pdf

This tip is from here.

Appendix
Here I had another difficulty: EPS images are not supported by pdflatex. Great! So I had to switch back to the old latex command…

Compilation with pdflatex:

#!/bin/bash

MAIN=main.tex

pdflatex $MAIN.tex
bibtex $MAIN
pdflatex $MAIN.tex
pdflatex $MAIN.tex

\rm *.aux *.blg *.dvi *.log *.bbl *.flg *.idx *.ind *.lof *.lot *.toc *.glo *.gls *.ilg 2>/dev/null

Compilation with latex:

#!/bin/bash

MAIN=main.tex

LATEX=latex

$LATEX $MAIN.tex
bibtex $MAIN
$LATEX $MAIN.tex
$LATEX $MAIN.tex
dvips $MAIN.dvi -o $MAIN.ps
ps2pdf $MAIN.ps

\rm $MAIN.ps *.aux *.blg *.dvi *.log *.bbl *.flg *.idx *.ind *.lof *.lot *.toc *.glo *.gls *.ilg 2>/dev/null

Compile Truecrypt from source

Problem

You want to compile Truecrypt from source but suddenly you realize that it’s not that trivial.

Solution

Let’s install some necessary packages:

sudo apt-get install build-essential libfuse-dev libgtk2.0-dev
sudo apt-get install nasm
sudo apt-get install libwxgtk2.8-dev
# This last one is for the problem "'wx/wx.h' is not found".

Download the source code of Truecrypt (link) and extract it to a folder. I put mine here: /opt/truecrypt-7.0a-source.

From the README of Truecrypt, we need this too: “RSA Security Inc. PKCS #11 Cryptographic Token Interface (Cryptoki) 2.20 header files (available at ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-11/v2-20) located in a standard include path or in a directory defined by the environment variable ‘PKCS11_INC’.”

So, visit ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-11/v2-20 and download the .h files. Actually, you only need 3 of them; I collected their URLs here. I put these files in this directory: /opt/truecrypt-7.0a-source/PKCS11_INC. Then, register it in an environment variable:

export PKCS11_INC=/opt/truecrypt-7.0a-source/PKCS11_INC

Now you can try to compile it. Go to /opt/truecrypt-7.0a-source and execute the command make. The executable will be placed here: Main/truecrypt.

Optional

I’m not sure that this step is necessary. If you have problems compiling the source, follow these instructions too.

For a successful compilation, you might need the wxWidgets library too. Download the latest stable release (choose wxAll in the list). Mine is extracted here: /opt/wxWidgets-2.8.12.

Get Truecrypt to compile wxWidgets for you:

export WX_ROOT=/opt/wxWidgets-2.8.12/
make WX_ROOT=/opt/wxWidgets-2.8.12 wxbuild

It will create the directory /opt/truecrypt-7.0a-source/wxrelease.

Further help

• How to compile TrueCrypt from source – Ubuntu Forums
• ubuntu10.10编译 truecrpyt-kissthink
• Building TrueCrypt 5.0a on Linux | random neuron misfires
• Still having trouble building TrueCrypt [Archive] – FedoraForum.org

Remove the binary package

If you installed Truecrypt with the binary .deb package, here is how to remove it:

sudo truecrypt-uninstall.sh

Install ncurses

sudo apt-get install libncurses5-dev libncursesw5-dev

If you want to compile a source code and you get the “curses.h: No such file or directory” error, then these are the packages you need to install.

Tip from here.