<p>Sorry for delay and sloppy messages.</p>
<ul class="contains-task-list">
<li>
<p>I solved  PATH problem, i can use</p>
</li>
<li class="task-list-item">
<p><input type="checkbox" id="" disabled="" class="task-list-item-checkbox">  make BOARD=esp8266-esp-12x -C examples/hello-world</p>
</li>
</ul>
<p>to compile hello-world example , during complilation it fails and output as follows;</p>
<pre><code>`Building application "hello-world" for "esp8266-esp-12x" with MCU "esp8266".

"make" -C /home/burak/RIOT-master/boards/esp8266-esp-12x
"make" -C /home/burak/RIOT-master/boards/common/esp8266
"make" -C /home/burak/RIOT-master/core
"make" -C /home/burak/RIOT-master/cpu/esp8266

/home/burak/RIOT-master/cpu/esp8266/thread_arch.c: Assembler messages:
**/home/burak/RIOT-master/cpu/esp8266/thread_arch.c:222**: Error: invalid register 'interrupt' for 'wsr' instruction**
/home/burak/RIOT-master/Makefile.base:83: recipe for target '/home/burak/RIOT-master/examples/hello-world/bin/esp8266-esp-12x/cpu/thread_arch.o' failed**
**make[2]: *** [/home/burak/RIOT-master/examples/hello-world/bin/esp8266-esp-12x/cpu/thread_arch.o] Error 1
/home/burak/RIOT-master/Makefile.base:20: recipe for target 'ALL--/home/burak/RIOT-master/cpu/esp8266' failed
make[1]: *** [ALL--/home/burak/RIOT-master/cpu/esp8266] Error 2**
/home/burak/RIOT-master/examples/hello-world/../../Makefile.include:464: recipe for target '/home/burak/RIOT-master/examples/hello-world/bin/esp8266-esp-12x/application_hello-world.a' failed
make: *** [/home/burak/RIOT-master/examples/hello-world/bin/esp8266-esp-12x/application_hello-world.a] Error 2
make: Leaving directory '/home/burak/RIOT-master/examples/hello-world'`
</code></pre>

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