Replacing the environment compile errors, 255 errors! Brothers seeking help!

My environment is xcode4.2for Snow Leopard, copy machines up to others later, he was xcod4.2.1 lion version, compiled on the following error while compiling a knowledge simulators have this wrong, I really do not have this machine error .
Will you great God, which in the end is why? Error report is as follows:

gcc-4.2: error trying to exec '/ xcode 4.2/Platforms/iPhoneSimulator.platform/Developer/usr/bin/arm-apple-darwin11-gcc-4.2.1': execvp: No such file or directory
Command / xcode 4.2/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 255

Seeking guidance.
Reply:
Dinga top, no one answered it?
Reply:
Can not find gcc, see if it is right directory
Reply:
Specifically how to modify it?