compilation error is:/tmp/guix-build-slim-1.3.6.drv-0/slim-1.3.6/panel.cpp: In constructor ‘Panel::Panel(Display*, int, Window, Cfg*, const string&, Panel::PanelType)’: /tmp/guix-build-slim-1.3.6.drv-0/slim-1.3.6/panel.cpp:51:27: error: ordered comparison of pointer with integer zero (‘GC’ {aka ‘_XGC*’} and ‘int’)
51 | if (WinGC < 0) {
| ~~~~~~^~~
make[2]: *** [CMakeFiles/libslim.dir/build.make:121:
CMakeFiles/libslim.dir/panel.cpp.o] Error 1
