environment variables in perl

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hi,
i am executing one shell script within perl script. now what i
need is , i need to make available all the variables set by that shell
script to perl script
for example

following is the shell script
build="abc"
export build
echo $build

now the value of $build i need to access in perl script

if i do in perl like this :
print "Environment is : $ENV{'build'}\n";
then it does not pint anything
can someone please suggest ??

regards
irf
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