Francesco Pietra wrote: > Probably I have found the way with > > apt-cache search (show) xorg-dev > > V 1:7.1.0-16 > > fp > I don't think so. Try this: mr@main:~$ apt-file search X11/IntrinsicP.h libxt-dev: usr/include/X11/IntrinsicP.h mr@main:~$ apt-file search X11/ShellP.h libxt-dev: usr/include/X11/ShellP.h So, you need package libxt-dev.