Added missing symlinks doc

Author: abhiTronix

QT_build_instructions.md

@@ -229,6 +229,19 @@ sudo mkdir /usr/local/qt5.15
 sudo chown -R pi:pi /usr/local/qt5.15
 ```
 
+Also don't forget to setup Important Symlinks as follows:
+  
+ ```sh
+ sudo ln -sf -r /usr/include/arm-linux-gnueabihf/asm /usr/include
+ sudo ln -sf -r /usr/include/arm-linux-gnueabihf/gnu /usr/include
+ sudo ln -sf -r /usr/include/arm-linux-gnueabihf/bits /usr/include
+ sudo ln -sf -r /usr/include/arm-linux-gnueabihf/sys /usr/include
+ sudo ln -sf -r /usr/include/arm-linux-gnueabihf/openssl /usr/include
+ sudo ln -sf /usr/lib/arm-linux-gnueabihf/crtn.o /usr/lib/crtn.o
+ sudo ln -sf /usr/lib/arm-linux-gnueabihf/crt1.o /usr/lib/crt1.o
+ sudo ln -sf /usr/lib/arm-linux-gnueabihf/crti.o /usr/lib/crti.o
+```
+
 That's it for Raspberry Pi setup.
 
  
@@ -828,4 +841,4 @@ This Project source-code and its precompiled binaries are licensed under the [**
 [tar]:https://www.gnu.org/software/tar/
 [pigz]:https://zlib.net/pigz/
 [license-badge]:https://img.shields.io/github/license/abhiTronix/raspberry-pi-cross-compilers.svg?style=flat&logo=gnu
-[kofi-badge]:https://www.ko-fi.com/img/githubbutton_sm.svg
+[kofi-badge]:https://www.ko-fi.com/img/githubbutton_sm.svg