I'm trying to use include-what-you-use on Debian 8.5. I made a test program that simply includes <iostream> and std::cout's "Hello, world" to the terminal. When I invoke iwyu on it, I get the following:
t1.cpp:1:10: fatal error: 'iostream' file not found
Clearly it can't seem to locate the system headers. I suppose I can force it by using the -I option, but I feel as though I shouldn't have to do that. Requiring me to tell it where the system headers are leads me to believe that something else is horribly wrong and using -I is just treating the symptom and not the cause.
Incidently, I have verified that invoking clang to compile my test program works just fine. So clang itself seems to work.
Thanks in advance!