ROOT 6 Build From Source Error on Ubuntu 14.04 LTS

[ferhue]

I had the same problem with the “Options.inc” in Ubuntu 16.04, for gcc 4.9 as well as gcc 5.4.

I am not really sure how I solved it, I tried two things (a and b) at the same time and then it suddenly worked.

Try:
a) Remove the git repository and clone again. Remove build directory and rebuild from scratch
b) Install libclang-dev, and then step a)

See:

ROOT build suddenly failing (Ubuntu 16.04 LTS)

Hello, until recently, I had no problems building the most current ROOT commits from the official git repository using CMake. However, builds are now failing, with the following error appearing first: [ 50%] Generating G__Rint.cxx, ../../lib/libRint.rootmap ERROR in cling::CIFactory::createCI(): cannot extract standard library include paths! CLING_CXX_INCL, CLING_CXX_PATH, and CLING_CXX_RLTV are undefined, there was probably an error during configuration. Log files containing the entire cons…