Fixup python macros, conditionl

python-virtualenv.spec

@@ -1,5 +1,7 @@
 # sitelib for noarch packages
-%{!?python_sitelib: %global python_sitelib %(%{__python} -c "from distutils.sysconfig import get_python_lib; print get_python_lib()")}
+%{!?__python2: %global __python2 /usr/bin/python2}
+%{!?python2_sitelib: %global python2_sitelib %(%{__python2} -c "from distutils.sysconfig import get_python_lib; print get_python_lib()")}
+%{!?python2_version: %global python2_version %(%{__python2} -c "import sys; sys.stdout.write(sys.version[:3])")}
 %if 0%{?fedora}
 %global with_python3 1
 %endif
@@ -21,7 +23,7 @@ BuildRequires:  python2-devel
 BuildRequires:  python-sphinx
 %endif
 
-%if %{?with_python3}
+%if 0%{?with_python3}
 BuildRequires:  python3-devel
 
 %if 0%{?fedora}