Can't vouch for it, but there may be an alternative:
"CopperSpice is a set of individual libraries which can be used to develop cross platform software applications in C++. It is a totally open source project released under the LGPL V2.1 license and was initially derived from the Qt framework. Over the last several years CopperSpice has completely diverged, with a goal of providing a first class GUI library to unite the C++ community."
"CopperSpice is a set of individual libraries which can be used to develop cross platform software applications in C++. It is a totally open source project released under the LGPL V2.1 license and was initially derived from the Qt framework. Over the last several years CopperSpice has completely diverged, with a goal of providing a first class GUI library to unite the C++ community."
https://www.copperspice.com