/librealsense/common/fw-update-helper.cpp:15：10：fatal error:common/fw/D4xx_fw_Image.h:No such file or directory

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Required Info
Camera Model	{ R200 / F200 / SR300 / ZR300 / D400 }
Firmware Version	(Open RealSense Viewer --> Click info)
Operating System & Version	{Win (8.1/10) / Linux (Ubuntu 14/16/17) / MacOS
Kernel Version (Linux Only)	(e.g. 4.14.13)
Platform	PC/Raspberry Pi/ NVIDIA Jetson / etc..
SDK Version	{ legacy / 2.<?>.<?> }
Language	{C/C#/labview/nodejs/opencv/pcl/python/unity }
Segment	{Robot/Smartphone/VR/AR/others }

Issue Description

<Describe your issue / question / feature request / etc..> /librealsense/common/fw-update-helper.cpp:15：10：fatal error:common/fw/D4xx_fw_Image.h:No such file or directory

[dorodnic]

This happens when internet connection cannot be detected during CMake process and there is a CMake warning about it. Best solution is to resolve the connectivity issue, but if that is not an option, if you download the latest code from the development branch, it will not give a compilation error but rather build the SDK with reduced functionality (in this case - no one-click firmware update and T265 support)