The default installation location for Microsoft Visual C++ is the Program Files directory. Many utilities, such as makedepend(1), have difficulty with directory names that contain spaces. You might need to address this.
If the installation directory name includes spaces, the PATH has spaces. If you encounter problems, for example, your shell cannot find cc(1) or c89(1), add double quotes (") around paths that contain spaces in the PATH variable. For example, you can change /dev/fs/C/Program Files/Microsoft Visual Studio/VC98/Bin to "/dev/fs/C/Program Files/Microsoft Visual Studio/VC98/Bin". If this does not solve the problem, try using the 8.3 version of the directory name; for example, Program Files would be PROGRA~1.
You can make the same change to the value of the environment variable INTERIX_COMPILERDIR, whose value is the directory in which you installed Visual C++.