diff -up setup.py.orig setup.py
--- setup.py.orig	2018-04-17 06:09:44.000000000 -0600
+++ setup.py	2018-05-18 15:00:29.947627141 -0600
@@ -42,10 +42,13 @@ if sys.platform == 'cygwin':
 # false positives in the longjmp() check.
 undef_macros = ["_FORTIFY_SOURCE"]
 
+extra_compile_args = ["-Wp,-U_FORTIFY_SOURCE"]
+
 kwds = dict(include_dirs=[opj("src", "cysignals"),
                           opj(cythonize_dir, "src"),
                           opj(cythonize_dir, "src", "cysignals")],
             depends=glob(opj("src", "cysignals", "*.h")),
+            extra_compile_args=extra_compile_args,
             define_macros=macros,
             undef_macros=undef_macros)