building psycopg2 on windows using mingw, "cannot find -lpq"

[GHUM]

> I use psycopg2 all the time on windows. I use the binary installer
> instead of source. Works great for me.
>
> -Tom
Me2. Just in 7 out of 200 it does not work with the currently
available binary installer, on some startups, so I decided to follow a
recommendation out of the psycopg2 list to compile it from trunk :(

Harald