Cmake errors when installing on mac osx

[bnord]

Context:

1. mac os x sierra
2. Conda environment activated
3. xcode with command line tools installed

While following installation instructions:

| => cmake ..
-- C++ version  configured.
-- Installing XACC to /usr/local. Override with -DCMAKE_INSTALL_PREFIX=...
CMake Error at /anaconda3/envs/proj-astroqml/share/cmake-3.11/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find Threads (missing: Threads_FOUND)
Call Stack (most recent call first):
  /anaconda3/envs/proj-astroqml/share/cmake-3.11/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  /anaconda3/envs/proj-astroqml/share/cmake-3.11/Modules/FindThreads.cmake:205 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  tpls/cppmicroservices/CMakeLists.txt:441 (find_package)


-- Configuring incomplete, errors occurred!
See also "/Users/nord/Code/xacc/build/CMakeFiles/CMakeOutput.log".
See also "/Users/nord/Code/xacc/build/CMakeFiles/CMakeError.log".

[bnord]

@amccaskey and @bnord discussed on project slack and the following solution was suggested

add the following lines of code to the top-level CMakeLists.txt file

set(CMAKE_THREAD_LIBS_INIT "-lpthread")
set(CMAKE_HAVE_THREADS_LIBRARY 1)
set(CMAKE_USE_WIN32_THREADS_INIT 0)
set(CMAKE_USE_PTHREADS_INIT 1)

I put them right before the option(XACC_BUILD_TESTS...) call

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