I checked the precompiled library files, and it doesn't look like there are any for gcc or mingw. (all the dll's come .lib files, gcc/mingw dll's usually come with .a files)
If so you will have to build one yourself.
this file seems to be the source:
http://sourceforge.net/projects/pdcurses/files/pdcurses/3.4/pdcurs34.zip/downloadBut i would just download the trunk from the svn repository for the latest source code.
but the directions to build it are in the win32 folder called README.
if you have troubles with that go to their forums and post a message. Once done, replace the library you have now with the new one you just made.
Note: With this library I would probably statically link it instead of dynamically anyway.