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Environment Settings

When running the C251 Compiler within the µVision IDE, no environment settings are needed. When running the C251 Compiler and utilities from the command prompt, set the following environment variables manually:

Variable Path Description
PATH \KEIL\C251\BIN Path to C251 executable programs.
TMP   Path for temporary files generated by the compiler. If the specified path does not exist, then the compiler generates an error and aborts compilation.
C251INC \KEIL\C251\INC Path for C251 include files.
C251LIB \KEIL\C251\LIB Path for C251 library files.


  • Set environment variables using Control Panel — System — Advanced — Environment Variables.

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