why the fck do you want that? you can not load a single map I'd assume... nor any texture. it's like the photoshop PSD's or the Gimp xcf's - if they are 20 mb big (about 20 layers and HD Quality) they are in ram 400+ mb big.
If you have the needed libraries installed, yeah. Check the readmes, it's all listed in there. You may want to create Makefile.local and put BUILD_CLIENT=0 in it, which will speed up the whole thing and doesn't require all of those libraries.