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# parse variable assignments out of the file
while ($ebuildcontents =~ /\b([-A-Z0-9_]+)=\"(.*?)\"{1}?/sgc) {
  $ebuildvars{$1} = $2;
}

foreach (keys %ebuildvars) {
  $ebuildvars{$_} =~ s/\$\{?([-A-Z0-9_]+)\}?/$ebuildvars{$1}/gs;
}