--- a/setup.py	2013-10-14 22:38:10.000000000 +0100
+++ b/setup.py	2017-12-20 16:05:16.726389781 +0100
@@ -370,7 +370,7 @@
       'ext_modules': plat_ext + [
             # _fastmath (uses GNU mp library)
             Extension("Crypto.PublicKey._fastmath",
-                      include_dirs=['src/','/usr/include/'],
+                      include_dirs=['src/'],
                       libraries=['gmp'],
                       sources=["src/_fastmath.c"]),