Hi Florian,
I've been using your bigsnpr package in a class I teach, and some of the students were having issues installing. One of the errors was this:

ld: warning: directory not found for option '-L/usr/local/lib/gcc/x86_64-apple-darwin13.0.0/4.8.2'
ld: library not found for -lquadmath
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [bigstatsr.so] Error 1
ERROR: compilation failed for package ‘bigstatsr’

• removing ‘/Library/Frameworks/R.framework/Versions/3.3/Resources/library/bigstatsr’
  Installation failed: Command failed (1)