Posted by ravas on Aug 26, 2016; 10:17pm
URL: https://forum.librecad.org/Compiling-in-QT-Creator-MSVC2013-Windows-64-bit-Error-dependent-generated-lib-libmuparser-a-does-not-tp5714214p5714215.html

Read about qmake
http://doc.qt.io/qt-5/qmake-manual.html

and checkout muparser.pro
https://github.com/LibreCAD/LibreCAD/blob/master/libraries/muparser/muparser.pro