Yesterday I installed glutg3-dev & xlibmesa-dev for my visualisation code, since the non-dev things do not have the header files. Today going throught the apt-get update, upgrade routine I see that these 2 files will be removed. My question is why, i didnot deselect them... A related question is how can i figure out if what package contains e.g. gl.h and then install it... Thanks emiel