Including Libraries into *.cpp Files

Using Arduino Programming Questions
1

Hello,

I try to write a little bit structured code. So I put all the functions belonging to one issue into a class with a *.h and *.cpp File.
When I try to include a non- Standard *.h file from a library into my *.h file of the class, I get a "No such file or directory".

myClass.h:

#ifndef __CL_KEYBOARD_H__
#define __CL_KEYBOARD_H__

#include <arduino.h>
#include <PS2Keyboard.h>

class clKeyboard
{
 public:
 clKeyboard(); 
 
 private: 
 PS2Keyboard keyboard;
};

#endif

clKeyboard.cpp:

#include "clKeyboard.h"

clKeyboard::clKeyboard()
{ 
}   
 }

mymain.ino:

#include "clKeyboard.h"
void setup() 
{
}

void loop() 
{
}

It gets me a:
In file included from clKeyboard.cpp:2:
/clKeyboard.h:5:25: warning: PS2Keyboard.h: No such file or directory
In file included from clKeyboard.cpp:2:
clKeyboard.h:13: error: 'PS2Keyboard' does not name a type

It seems that the system is unable to find the *.h in the library- directory. Is there a system variable for the full pathname I can use for the header file?

When I put the include- statement into the *.ino file the system is able to find it.
This puts some question marks on top of my head.

2

You can't, any more than anyone else, hide the fact that a library needs a library from the sketch. Include PS2Keyboard.h in the sketch.