lxqt-about is a dialogue window providing information about LXQt and the system it's running on.
The only runtime dependency is liblxqt.
CMake is needed to build as well as optionally Git to pull latest VCS checkouts. The localization files were outsourced to repository lxqt-l10n so the corresponding dependencies are needed, too. Please refer to this repository's README.md for further information.
Code configuration is handled by CMake. CMake variable CMAKE_INSTALL_PREFIX will normally have to be set to /usr.
To build run make, to install make install which accepts variable DESTDIR as usual.
The library is provided by all major Linux distributions like Arch Linux, Debian, Fedora and openSUSE. Just use your package manager to search for string lxqt-about.