>> Can you clarify on which systems you are working and which dependencies cause headaches? In my case I am working on an old machine, where many things have been installed in the past and cause conflicts. So until a new machine can be bought I am attempting to get this done in a custom application directory, where QGIS is then called from a script where the needed environment vars are set so that everything needed is found first. In my case it is since there are QT3, QT4 and older QT5 installed. So a separate, clean, QT5 is needed.
At present I have everything compiled, but QGIS3 fails due to something, some complaining about different libpng's being found: # libpng warning: Application was compiled with png.h from libpng-1.6.10 # libpng warning: Application is running with png.c from libpng-1.2.56 # libpng error: Incompatible libpng version in application and library Here I assume the default libcairo loads libpng-1.2.56, which QT5 used libpng-1.6.10, which is installed in /usr/local/lib for librasterlite2. So at the moment I have installed libcairo using libpng-1.6.10 in /usr/local/lib, and recompiling QT5 using the internal PNG/JPEG libs. >>In many situations, a build of Qt is not required and doing this requires deep understanding of all the involved libraries. Yes and the idea a Wiki page/area for 'Building QGIS from scratch' could assist in making that easier. Mark
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