I checked out a copy of a C++ application from SourceForge (HoboCopy, if you're curious) and tried to compile it.
Visual Studio tells me that it can't find a particular header file. I found the file in the source tree, but where do I need to put it, so that it will be found when compiling?
Are there special directories?
Visual Studio looks for headers in this order:
In your case, add the directory that the header is to the project properties (Project Properties → Configuration → C/C++ → General → Additional Include Directories).
Actually On my windows 10 with visual studio 2017 community, the C++ headers path are:
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include
C:\Program Files (x86)\Windows Kits\10\Include\10.0.17134.0\ucrt
The 1st contains standard C++ headers such as
<algorithm>. The 2nd contains old C headers such as
<string.h>. The version number can be different based on your software.
Hope this would help.