On Linux, megaglest_g3dviewer links against libXext, libdl and libfreetype but doesn't use any functions from them:
dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/megaglest/usr/games/megaglest_g3dviewer debian/megaglest/usr/games/megaglest debian/megaglest/usr/games/megaglest_editor were not linked against libXext.so.6 (they use none of the library's symbols)
dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/megaglest/usr/games/megaglest_g3dviewer debian/megaglest/usr/games/megaglest debian/megaglest/usr/games/megaglest_editor were not linked against libdl.so.2 (they use none of the library's symbols)
dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/megaglest/usr/games/megaglest_g3dviewer debian/megaglest/usr/games/megaglest debian/megaglest/usr/games/megaglest_editor were not linked against libfreetype.so.6 (they use none of the library's symbols)