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From Ghpsdr3 SDR project
How to compile Qt5
In order to compile Qt5, is mandatory to start from a clean system, especially if you are using a 8 GB SD card. Moreover, you have to install the mesa packages:
sudo apt-get install mesa-utils mesa-common-dev libgl1-mesa-dev x11proto-xext-dev libxrender-dev
missing this step, the build will fail on unknown OpenGL symbols, even if the OpenGL build has been explicitly disabled.
Clone the base repository:
cd git clone git://gitorious.org/qt/qt5.git qt5
this is only a template repository, it is almost empty, we need to download the whole code using the initialization script
cd qt5 perl init-repository --no-webkit
Next we have to configure, avoiding to compile examples and test programs, in order to shorten the build time:
./configure -developer-build -opensource -nomake examples -nomake tests -no-pch -qt-xcb make -j8
If the build ends successfully, there is no need to install the package, it is enough use includes and libraries as found in ~/qt5/qtbase directory.
export PATH=~/qt5/qtbase/bin:$PATH
Reference
Building Qt 5 from Git on Qt Project web site
Forcing all CPU's active
echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor