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#!/usr/bin/perl
use strict;
...
    \%hash;
}
print Dumper build(@arr);

#!/usr/bin/perl
use strict;
...
    },
  }
);

Benchmark: timing 100000 iterations of eval_string, manual...
eval_string: 10 wallclock secs ( 9.31 usr +  0.05 sys =  9.36 CPU) @ 1
+0683.76/s (n=100000)
    manual:  2 wallclock secs ( 2.07 usr +  0.01 sys =  2.08 CPU) @ 48
+076.92/s (n=100000)