what the difference between "PocoXXX.a" and "PocoXXXd.a"?

[beck]

Poco version : 1.5.1
OS : Mac

After I using "make" command to compile, the libs come out two file, one is named "PocoFoundation.a" and the other name is "PocoFoundationd.a".
I googled, and searched in this forum, but did not had answer yet.
Can anybody tell me what the difference between them?

Thanks anyway.

[fbraem]

PocoXXXd.a is the debug version of the library. PocoXXX.a is the release version (without debug info).

[beck]

Thanks, so I just need the lib without d.