[llvm] r200595 - Introduce line editor library.

[David Fang]

Hi,
 	Do you have a way to tell cmake where to look for histedit.h?  I 
happen to be on a system where /usr/include/histedit.h is tool old and has 
compilation errors:

/Users/fang/local/src/LLVM-svn/llvm/lib/LineEditor/LineEditor.cpp: In 
function 'unsigned char ElCompletionFn(EditLine*, int)':
/Users/fang/local/src/LLVM-svn/llvm/lib/LineEditor/LineEditor.cpp:124: 
error: 'EL_GETFP' was not declared in this scope
/Users/fang/local/src/LLVM-svn/llvm/lib/LineEditor/LineEditor.cpp: In 
destructor 'llvm::LineEditor::~LineEditor()':
/Users/fang/local/src/LLVM-svn/llvm/lib/LineEditor/LineEditor.cpp:232: 
error: 'EL_GETFP' was not declared in this scope
make[2]: *** 
[lib/LineEditor/CMakeFiles/LLVMLineEditor.dir/LineEditor.cpp.o] Error 1

However, I have a newer one installed in another location.
Is there a way to point it to use a different root besides passing 
-I/path/include
to CMAKE_CXX_FLAGS and passing -L/path/lib to CMAKE_*_LINKER_FLAGS?

It might also be nice to test for histedit meeting some minimum version or 
feature requirement.

David

-- 
David Fang
http://www.csl.cornell.edu/~fang/