$cd /usr/local/apache2/cgi-bin
$sudo chmod a+x * 
$ls -l transeuid
-rwxr-xr-x    1 nobody  wheel  5475 Nov 11 22:14 transeuid
$ sudo chown nobody transeuid  
$ sudo chmod +s transeuid  
$ls -l transeuid
-rwsr-sr-x     1 nobody  wheel  5475 Nov 11 22:14 transeuid

Optional: Need to recompile transeuid.c if transeuid can not be executed
gcc -o transeuid transeuid.c

