FTS-1295: add range for pycurl version

setup.py

@@ -41,7 +41,7 @@ def apply_pycurl_workaround():
 
 
 # Ugly hack to pick a version that compiles in SLC6
-pycurl_ver = '>= 7.19, <= 7.43.0.1'
+pycurl_ver = '>= 7.19, <= 7.43.0.1 --global-option=="--with-nss"'
 dist = platform.dist()
 if dist[0] in ('redhat', 'centos'):
     apply_m2crypto_workaround()