---- About LibreCAD ----
LibreCAD is a 2D CAD drawing tool based on the community edition of QCad (www.qcad.org). 
LibreCAD has been re-structured and ported to qt4 and works natively cross platform between OSX, Windows and Linux. 
See www.librecad.org

---- UNIX and OSX users ----
Unzip or checkout a version of LibreCAD into a directory.
CD into that directory and follow these instructions:

# Build makefile and compile LibreCAD

qmake 
make

---- Ubuntu/Debian users ----

Make sure you have the qt-4 SDK installed 
Install the qt4 SDK by executing the following commands:

sudo apt-get install g++ gcc make git-core libqt4-dev qt4-qmake libqt4-qt3support qt4-dev-tools

For SVN see elso : 
http://www.librecad.org/2010/10/debian-64-bit-and-ubuntu-compile-how-to/

For git see also:
http://librecad.org/cms/home/from-source/linux.html

NOTE 1: On systems (Ubuntu??) You might need to run qmake-qt4 instead of just qmake

---- Windows Users ----

Download a copy of QT SDk from http://qt.nokia.com/downloads/

After installation, start qtCreator and load LibreCAD.pro,
from the the build menu select 'Build All'


----- 
Ubuntu Lucid
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)
Using Qt version 4.6.2 in /usr/lib

----- (RVT)
OSX 10.5.8
i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5493)
Using Qt version 4.6.3 in /opt/local/libexec/qt4-mac/lib

----- (RVT)
Debian 5.0.3
gcc (Debian 4.3.2-1.1) 4.3.2
Using Qt version 4.4.3 in /usr/lib

----- (RVT)
Windows XP
Using Qt version 4.7.0