[Qt-creator] Installing Qt 4.6

[Christophe Meessen]

Hello,

I had some problem to install Qt properly so it worked right out of the 
box. Some required steps are missing on the download page.

Here are the missing steps in case someone cares.

1. Assume you downloaded the latest version of Qt, set it to executable 
and sudo run it.

2. I then define a symbolic link for easy upgrade : ln -s 
/opt/qtsdk-xxx  /opt/qt

3. Some environment variables need to be set. I use the system wide 
profile to share it with other users:
     sudo -s
     cat > /etc/profile.d/qtconfig.sh << EOF
     if [-d /opt/qt ]; then
         export QTDIR="/opt/qt"
         export PATH="$QTDIR/bin:$QTDIR/qt/bin:$PATH"
         export QMAKESPEC="linux-g++"
         export CC="gcc"
     fi
     EOF

     It may be required to logout and login for the profile to be taken 
in account.
     These instructions could be as well stored in the user .profile for 
user specific setup.

4. The debugger wont work if the following instructions are not applied. 
LD_LIBRARY_PATH is deprecated :
     sudo -s
     echo "/opt/qt/lib" > /etc/ld.so.conf.d/qtlibs.conf
     ldconfig

     This requires administrator priviledges. Don't know how to setup 
library path for user specific environment.
     The ldconfig command can be called with the -v option and a grep Qt 
to check if the Qt libraries are found.

I spend two days sorting this out. The qt installation process 
description is laking these steps with the consequence that it won't be 
possible to compile anything if step 3 is missing and it won't be 
possible to debug anything if step 4 is missing. I hope this help people 
enjoying discovering Qt impessive IDE and SDK.

-- 

Bien cordialement,

Ch. Meessen