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Building QGIS 0.8 with Qt4.x

attachment:qgis0.8splash.gif

Requires: Ubuntu Dapper See Also: BuildingQuantumGisFromSource

These notes are for if you want to build QGIS from source. One of the major aims here is to show how this can be done using binary packages for all dependencies - building only the core QGIS stuff from source. Currently the gdal grass raster driver needs to be built from source too - Ill revise these notes when a suitable package is available. I prefer this approach because it means we can leave the business of managing system packages to apt and only concern ourselves with coding QGIS! Note this document is still under construction...and is continually evolving.

As I write this QGIS 0.8 is undergoing major changes and is still considered unstable. QGIS 0.8 is a major revision of the QGIS codebase, including a port to Qt4. I will describe how to install it alongside your existing QGIS 0.7.4 install (which you can install using the procedure described in BuildingQuantumGisPoint7FromSource). This document assumes you have made a fresh install and have a 'clean' system. These instructions should work fine if this is a system that has already been in use for a while, you may need to just skip those steps which are irrelevant to you.

Note: This is a 'cut and paste' tutorial - in most cases you can simply copy the commands listed in codeblocks that look like this:

somecommand to be pasted

Note: This document is still under construction. /!\

Prepare apt

The packages qgis depends on to build are available in the "universe" component of Ubuntu. This is not activated by default, so you need to activate it:

1. Edit your /etc/apt/sources.list file.
2. Uncomment the all the lines starting with "deb"

Also you will need to be running (K)Ubuntu 'dapper' in order for all dependencies to be met.

Now update your local sources database:

sudo apt-get update

Install Qt4

sudo apt-get install libqt4-core libqt4-debug libqt4-debug-dev libqt4-dev libqt4-gui libqt4-qt3support libqt4-sql lsb-qt4 qt4-designer qt4-dev-tools qt4-doc qt4-qtconfig uim-qt gcc libapt-pkg-perl resolvconf

A Special Note: If you are following this set of instructions on a system where you already have Qt3 development tools installed, there will be a conflict between Qt3 tools and Qt4 tools. For example, qmake will point to the Qt3 version not the Qt4. Ubuntu Qt4 and Qt3 packages are designed to live alongside each other. This means that for example if you have them both installed you will have three qmake exe's:

/usr/bin/qmake -> /etc/alternatives/qmake
/usr/bin/qmake-qt3
/usr/bin/qmake-qt4

The same applies to all other Qt binaries. You will notice above that the canonical 'qmake' is managed by apt alternatives, so before we start to build QGIS, we need to make Qt4 the default. To return Qt3 to default later you can use this same process.

You can use apt alternatives to correct this so that the Qt4 version of applications is used in all cases:

sudo update-alternatives --config qmake
sudo update-alternatives --config uic
sudo update-alternatives --config designer
sudo update-alternatives --config assistant
sudo update-alternatives --config qtconfig
sudo update-alternatives --config moc
sudo update-alternatives --config lupdate
sudo update-alternatives --config lrelease
sudo update-alternatives --config linguist

Use the simple command line dialog that appears after running each of the above commands to select the Qt4 version of the relevant applications.

Install additional software dependencies required by QGIS

sudo apt-get install gdal-bin libgdal1-dev libgeos-dev proj libtool libgdal-doc libhdf4g-dev libhdf4g-run autoconf2.13 automake1.9 python-dev swig libgsl0-dev g++ libjasper-1.701-dev libtiff4-dev  subversion gsl-bin libsqlite3-dev sqlite3 ccache

GRASS Specific Steps

Note: If you don't need to build with GRASS support, you can skip this section.

Install GRASS

Now you can install grass from dapper:

sudo apt-get install grass libgrass-dev libgdal1-grass

Setup ccache (Optional)

You should also setup ccache to speed up compile times:

cd /usr/local/bin
sudo ln -s /usr/bin/ccache gcc
sudo ln -s /usr/bin/ccache g++

Prepare your development environment

As a convention I do all my development work in $HOME/dev/<language>, so in this case we will create a work environment for C++ development work like this:

mkdir -p ${HOME}/dev/cpp
cd ${HOME}/dev/cpp

This directory path will be assumed for all instructions that follow.

Check out the QGIS Source Code

There are two ways the source can be checked out. Use the anonymous method if you do not have edit privaleges for the QGIS source repository, or use the developer checkout if you have permissions to commit source code changes.

1. Anonymous Checkout

cd ${HOME}/dev/cpp
svn co https://svn.qgis.org/repos/qgis/trunk/qgis qgis

2. Developer Checkout

cd ${HOME}/dev/cpp
svn co --username <yourusername> https://svn.qgis.org/repos/qgis/trunk/qgis qgis

The first time you check out the source you will be prompted to accept the qgis.org certificate. Press 'p' to accept it permanently:

Error validating server certificate for 'https://svn.qgis.org:443':
 - The certificate is not issued by a trusted authority. Use the
   fingerprint to validate the certificate manually!
Certificate information:
 - Hostname: svn.qgis.org
 - Valid: from Apr  1 00:30:47 2006 GMT until Mar 21 00:30:47 2008 GMT
 - Issuer: Developer Team, Quantum GIS, Anchorage, Alaska, US
 - Fingerprint: 2f:cd:f1:5a:c7:64:da:2b:d1:34:a5:20:c6:15:67:28:33:ea:7a:9b
(R)eject, accept (t)emporarily or accept (p)ermanently?

*********************** Checked up to here ******************

Starting the compile

The Qt files are not in the expected place, so you need to tell configure where to look for them. Or you can export QTDIR=/usr/share/qt3.

Now you can proceed to the initial configure step:

./autogen.sh --enable-debug --prefix=/usr --with-qtdir=/usr/share/qt3 --with-grass=/usr/lib/grass

At the end of the autogen / configure process above you should see output like below, indicating that qgis is going to be built with all its bells & whistles...

export QTDIR=/usr/local/Trolltech/Qt-4.0.1/
export PATH=$QTDIR/bin/:$PATH

==========================================
qgis 0.7.9devel2
------------------------------------------
GDAL/OGR      : yes (Version 1.2.6)
GEOS          : yes (Version 2.1.1)
PostgreSQL    : yes (Version 8.0.3)
GRASS         : yes
SPIT          : yes
Georeferencer : yes
GPS/GPX       : yes
PROJ4         : yes
SQLITE3       : yes
Python        : no

Debug         : yes
Plugin dir    : ${exec_prefix}/lib/qgis

The binary will be installed in /home/aps02ts/apps//bin

Now we go on to the compilation step. I like to time the build so I can get an idea of how long it takes in general. THe first time you build will take substantially longer as ccache will not receive many hits. Subsequent builds should be much faster!

echo `date` > /tmp/qgis_compile.txt ; make ; echo `date` >> /tmp/qgis_compile.txt

mkdir $HOME/apps
./autogen.sh --enable-debug --prefix=$HOME/apps/ --with-qtdir=/usr/local/Trolltech/Qt-4.0.1/ --with-grass=/usr/lib/grass && make && sudo make install

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