Linux installations in opt

For KDE Web Dev correct compilation use:

apt-get install kdelibs4c2a xorg-dev libqt3-headers kdelibs5-dev kdelibs4-dev
./configure --prefix=/opt/kdewebdev

Warning: you chose to install this package in /opt/kdewebdev,
but KDE was found in /usr.
For this to work, you will need to tell KDE about the new prefix, by ensuring that KDEDIRS contains it, e.g. export KDEDIRS=/opt/kdewebdev:/usr
Then restart KDE.

BlueFish:
apt-get install intltool
./configure --prefix=/opt/bluefish

Pinta:
apt-get install mono-xbuild