Building llvm ( clang ) samples.c problem

I am building llvm, with clang, on Mingw in Windows and eventually ran into this error:

"llvm[4]: Compiling sample.c for Debug+Asserts build
C:/Programming/VersionControl/llvm/projects/sample/lib/sample/sample.c:18:20: fatal error: sample.h: No such file or directory
compilation terminated."

Looking at sample.c I see:

#include "sample.h"

but there is no sample.h in the same directory as sample.c but only in the projects/sample/include directory.

Can this please be fixed, probably with an '#include <sample.h>' instead ?

It does look like everything else built OK and the error is only occuring trying to build the sample program.