I am using WxWidgets 2.4.2 (stable) under Win32 with MinGW 3.1.0 and DevCpp 4990. I use my own makefile makefile.g95, not one generated by DevCpp. It has been copied from wxWidgets's examples and has been modified for my purposes. I want to use Boost C++ library (www.boost.org) in my project and therefore need to add path to it to include dirs of g++. I has being trying to edit file <wxdir>/src/makeg95.env and add path to Boost such as that been done for wxWidgets but I was not able to do it.