Hello.
I use the QNX Neutrino RTOS 6.21.
When i run gcc, appear message “/bin/sh/: gcc: not found”.
Why?
Thank you. 
That means you haven’t install the development package. From memory 6.21 install in two steps first the core and then development stuff.
Hello, mario.
Thanks for your help.
I need know about QNX 6.21 install in two steps as example.
Thank you. 
Discussed many times in the past on this forum. The following are just two examples:
openqnx.com/PNphpBB2-viewtopic-t2699-.html
openqnx.com/PNphpBB2-viewtopic-t3128-.html