diff -up MDAnalysis-0.17.0/setup.py.flags MDAnalysis-0.17.0/setup.py

--- MDAnalysis-0.17.0/setup.py.flags	2018-01-24 19:00:10.000000000 +0100

+++ MDAnalysis-0.17.0/setup.py	2018-02-23 00:51:37.033514330 +0100

@@ -253,7 +253,7 @@ def extensions(config):

     use_cython = config.get('use_cython', default=not is_release)

     use_openmp = config.get('use_openmp', default=True)

-    extra_compile_args = ['-std=c99', '-ffast-math', '-O3', '-funroll-loops']

+    extra_compile_args = ['-std=c99']

     define_macros = []

     if config.get('debug_cflags', default=False):

         extra_compile_args.extend(['-Wall', '-pedantic'])