Problem with pkgconfig on Mac

[p.ten]

I've installed pkg-config via DarwinPorts, in /opt/local/bin (version 0.21).
Then i set my profile file (in my home directory) with these parameters:

export
PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:opt/local/lib/pkgconfig:usr/X11R6/lib/pkgconfig:$PKG_CONFIG_PATH

It seems to be correct, and I get it correctly running "env", BUT, when I
write in Terminal (bash):

pkg-config --modversion filename

it works only with file.pc stored in first path directory
(usr/local/lib/pkgconfig), and does NOT work with, for instance, fontconfig,
that stays in usr/X11R6/lib/pkgconfig.
To get it found by pkg config I have to put "usr/X11R6/lib/pkgconfig at the
first place.
Where did I wrong?
Sincerely

P.Tenny 
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