w.program.h not found in libarary

Arduino: 1.8.5 (Windows 8.1), Board: "Arduino/Genuino Uno"

In file included from C:\Users\STEADF~1\AppData\Local\Temp\arduino_modified_sketch_569081\sketch_jun08c.ino:3:0:

C:\Program Files (x86)\Arduino\libraries\JPEGCamera/JPEGCamera.h:10:22: fatal error: WProgram.h: No such file or directory

#include "WProgram.h"


compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

WProgram means Wiring Program

Wiring is IDE that M Banzi forks to create Arduino.
Wiring was released in 2004 and Arduino in 2005.

With Arduino you must use :
#include "Arduino.h"

To my knowledge, it actually depends on the IDE. I know that any version above 1.6.6 needs to use Arduino.h, not familiar with earlier versions so not sure where the change happened.

not sure where the change happened.

It started being Arduino.h way back at 1.0 IIRC.

Wiring released the first his version 1.0. He renamed the WProgram.h file to Wiring.h
Arduino was surprised and a month later arduino urgently released his version 1.0 where he renamed the file WProgram.h to Arduino.h

As Arduino 1.0 was released in a hurry, arduino 1.0 was followed very quickly by 1.0.1, 1.0.2, 1.0.3, 1.0.4.
The first stable version was 1.0.5 followed by 1.0.6 which finally brought the display of line numbers.