I'm sorry, I don't see where you said that.
In the original Unix implementations, /usr was where the home directories of the users were placed (that is to say, /usr/someone was then the directory now known as /home/someone). In current Unices, /usr is where user-land programs and data (as opposed to 'system land' programs and data) are. The name hasn't changed, but it's meaning has narrowed and lengthened from "everything user related" to "user usable programs and data". As such, some people may now refer to this directory as meaning 'User System Resources' and not 'user' as was originally intended.
The original idea behind '/usr/local' was to have a separate ('local') '/usr' directory on every machine besides '/usr', which might be just mounted read-only from somewhere else. It copies the structure of '/usr'. These days, '/usr/local' is widely regarded as a good place in which to keep self-compiled or third-party programs. The /usr/local hierarchy is for use by the system administrator when installing software locally. It needs to be safe from being overwritten when the system software is updated. It may be used for programs and data that are shareable amongst a group of hosts, but not found in /usr. Locally installed software must be placed within /usr/local rather than /usr unless it is being installed to replace or upgrade software in /usr.
It is recommended to use the fpcUP updater-installer for first time users of Lazarus, which installs fpc & Lazarus in one go into a single subdirectory structure ( ~/development ).
A normal official full install will also take care of that, btw, but there are some Linux distributions that don't resolve these.
Lazarus has to be the most frustrating software to install that I've ever encountered.
The name actually is libx11-dev - try that!A pity that the script does not spell the package name right..
Sorry about that:build-essentialWithout the 's' at the end. My fault. ( Original posts corrected )A good idea is to use Synaptic to visually check if the packages are available. As Handoko pointed out.
That does not sound good.What happens if you try to install something that depends on it, like 'apt-build' ?