XnView Software

You can convert the *.lib files inside the GflSDK/lib/ into *.a files (suitable for MinGW) by reimp program. "reimp" is a part of mingw-utils from http://www.mingw.org/download.shtml . Once you have reimp, just run "reimp libgfl.lib" and "reimp libgfle.lib" inside GflSDK/lib/ and you will get files ...