I want to add "Botan: Crypto and TLS for Modern C++" Library to Cross compiler of qt5.9.1 which is on Ubuntu 16.04 , 64 bit system. When i try to compile .pro file using command - /usr/local/Trolltech/Qt-5.9.1-nexell32-x86tools/bin/qmake ../example.pro gives Error message build.h:432:6: er...