Hi,

I've got the same error on Archlinux. I submitted PKGBUILD in AUR, take a look: https://aur.archlinux.org/packages.php?ID=57644 

I get an error when compiling:

[ 10%] Building C object src/CMakeFiles/lxpanel2.dir/applets/app-menu-applet.c.o
/home/hsgg/lxde/lxpanel2/build/src/applets/app-menu-applet.c:33:33: fatal error: gio/gdesktopappinfo.h: No such file or directory