On the beginning of Configure perl program, there is a statment as follows:

:
eval 'exec perl -S $0 ${1+"$@"}'
     if $running_under_some_shell;
##
##  Configure -- OpenSSL source tree configuration script
##

Could someone help to explain? I can not find the means of the symbol 
":" at the beginning of perl program and the variable 
$running_under_some_shell.

Regards,
Guopei Qiao

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