All of the files in this directory are for use with Borland C++ 4.5 On my system these files are located in the C:\PCE32\Borland directory. If you have problems compiling the files move the files to this directory. Also my Borland C++ 4.5 directory is D:\bc45 , you may have to alter from the Options\Project menu the directory settings to match your own. eg change from d:\bc45\include to match your own directories