ld: library not found for -lomp

Question

In macOS Sierra, installation for xgboost with openmp enabled always fails.

From https://xgboost.readthedocs.io/en/latest/build.html,

I\'ve trie

Answer 1

In my case I used a version of clang that came with Homebrew's llvm instead of the one that came with the Laptop from the factory, and it worked.

Answer 2

In my case I solved adding the following linker flag in addition to -lomp:

-Lpath_to_libomp.dylib_folder

or something like:

-Llib/

Answer 3

SOLVED

cd /usr/local/lib
ln -s /usr/local/Cellar/llvm/4.0.0_1/lib/libomp.dylib libomp.dylib

llvm installation miss its symbolic link.