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CodeBlocksPortable/WATCOM/samples/clibexam/setenv.c

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#include <stdio.h>
#include <stdlib.h>
#include <env.h>
void main()
{
char *path;
if( setenv( "INCLUDE", "D:\\WATCOM\\H", 1 ) == 0 )
if( (path = getenv( "INCLUDE" )) != NULL )
printf( "INCLUDE=%s\n", path );
}