python-pyasn1: Fixed build error

python-pyasn1.spec

@@ -1,6 +1,6 @@
 Name:           python-pyasn1
 Version:        0.3.7
-Release:        5
+Release:        6
 Summary:        ASN.1 library for Python
 License:        BSD
 Source0:        https://github.com/etingof/pyasn1/archive/v%{version}.tar.gz
@@ -8,7 +8,7 @@ Source1:        https://github.com/etingof/pyasn1-modules/archive/v0.1.5.tar.gz
 URL:            http://pyasn1.sourceforge.net/
 BuildArch:      noarch
 BuildRequires:  python2-devel python2-setuptools python3-devel python3-setuptools
-BuildRequires:  python-unversioned-command python2-sphinx
+BuildRequires:  python-unversioned-command python2-sphinx libffi6
 
 %description
 Abstract Syntax Notation One (ASN.1) is a technology for exchanging structured data
@@ -18,7 +18,6 @@ The pyasn1 library implements ASN.1 support in pure-Python.
 
 %package -n     python2-pyasn1
 Summary:        Pyasn1 in python 2
-
 Provides:       python2-pyasn1-modules
 Obsoletes:      python2-pyasn1-modules
 
@@ -32,7 +31,6 @@ Pyasn1 in python 2.
 
 %package -n     python3-pyasn1
 Summary:        Pyasn1 in python 3
-
 Provides:       python3-pyasn1-modules
 Obsoletes:      python3-pyasn1-modules
 %{?python_provide:%python_provide python3-pyasn1}
@@ -52,7 +50,6 @@ Documentation for python-pyasn1.
 
 %prep
 %autosetup -n pyasn1-%{version} -p1 -b1
-
 rm -rf %{py3dir}
 cp -a . %{py3dir}
 cp -a ../pyasn1-modules-0.1.5 %{py3dir}-modules
@@ -71,7 +68,6 @@ cd %{py3dir}-modules
 cd -
 
 %install
-
 cd %{py3dir}
 %{__python3} setup.py install --skip-build --root %{buildroot}
 cd -
@@ -119,6 +115,9 @@ cd -
 %doc doc/build/html/*
 
 %changelog
+* Thu Jan 16 2020 Ling Yang <lingyang2@huawei.com> - 0.3.7-6
+- Fixed build error
+
 * Wed Nov 13 2019 dongjian <dongjian13@huawei.com> - 0.3.7-5
 - Package init