Creating the vector in one 16-bit operation rather than several 1-bit operations simplifies the unpack process.
johngg@shiraz:~/perl/Monks$ perl -Mstrict -Mwarnings -E '
my @bitPosns = ( 0, 2, 8, 9, 10 );
my $val;
$val += 2 ** $_ for @bitPosns;
my $vec;
vec( $vec, 0, 16 ) = $val;
say unpack q{B16}, $vec;'
0000011100000101
Six of one, a half dozen of the other I suppose.
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