Weird version comparison results

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

I need a depedency on IPC::Cmd 0.46, which is included from Perl 5.10.1 onwards.

So I used
DEPENDS+=       perl>=5.10.1,p5-IPC-Cmd>=0.46:../../devel/p5-IPC-Cmd
but that started to build p5-IPC-Cmd despite having perl 5.10.1nb1 installed.

$ pkg_admin pmatch "perl>=5.10.1" "perl-5.10.1" && echo TRUE || echo FALSE
TRUE
$ pkg_admin pmatch "perl>=5.10.0,p5-IPC-Cmd>=0.46" "perl-5.10.1" && echo TRUE 
|| echo FALSE
TRUE
$ pkg_admin pmatch "perl>=5.10.1,p5-IPC-Cmd>=0.46" "perl-5.10.1" && echo TRUE 
|| echo FALSE
FALSE

What am I doing wrong?