Documentation? force macports to use my lib instead of formula

[gaming-hacker (G Alexander)]

after reading the documentation,

[[[​https://guide.macports.org/}}}

i cannot find the answer. i have built and installed my own versions of ffmpeg, x265,x264 libs and binaries. and placed links to them in the default macports locations /opt/local/bin, /lib,

now i'm installing a opencv which has dependencies on ffmpeg and x265 and it fails to install opencv because of the "foreign" libs already.

i'd rather force macports to use my lib than force it to skip a dependency.

can someone update the documention?