Be more explicit about Python build dependencies

- Require python2-devel
- Tell autotools that PYTHON is python2

itstool.spec

@@ -1,6 +1,6 @@
 Name:           itstool
 Version:        2.0.2
-Release:        7%{?dist}
+Release:        8%{?dist}
 Summary:        ITS-based XML translation tool
 
 Group:          Development/Tools
@@ -11,7 +11,8 @@ Source0:        http://files.itstool.org/itstool/%{name}-%{version}.tar.bz2
 BuildArch:      noarch
 
 BuildRequires:  libxml2-python
-BuildRequires:  python
+BuildRequires:  python2
+BuildRequires:  python2-devel
 Requires:       libxml2-python
 
 %description
@@ -23,6 +24,7 @@ how to separate it into PO file messages.
 %setup -q
 
 %build
+export PYTHON=%{__python2}
 %configure
 make %{?_smp_mflags}
 
@@ -36,6 +38,10 @@ make install DESTDIR=$RPM_BUILD_ROOT
 %doc %{_mandir}/man1/itstool.1.gz
 
 %changelog
+* Mon Feb 05 2018 Petr Viktorin <pviktori@redhat.com> - 2.0.2-8
+- Be more explicit about Python build dependencies
+  (Require python2-devel, tell autotools that PYTHON is python2)
+
 * Wed Jul 26 2017 Fedora Release Engineering <releng@fedoraproject.org> - 2.0.2-7
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Mass_Rebuild