Quick question on the OpenBSD ports system

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http://www.linuxquestions.org – I'm quite new to OpenBSD so bear with me for one minute. I've installed OpenBSD 4.8-release fetched the ports tree from ftp://ftp.openbsd.org/pub/OpenBSD/4.8/ (I think it was) and was trying to build wmii. I was quite surprised to see that make was trying to build gtk+ and around another 100 packages which are not required by wmii (I'm using it for 3-4 years now) and which are likewise not required when I install wmii using pkg_add. More surprisingly, it installed an older version of autoconf then I already had installed through pkg_add. Are pkg_add and port mutually exclusive? Is this kind (HowTos)