Automatically figure out ftp download dir

libsigc++20.spec

@@ -1,3 +1,6 @@
+# first two digits of version
+%define release_version %(echo %{version} | awk -F. '{print $1"."$2}')
+
 Name:           libsigc++20
 Version:        2.2.8
 Release:        4%{?dist}
@@ -6,7 +9,7 @@ Summary:        Typesafe signal framework for C++
 Group:          System Environment/Libraries
 License:        LGPLv2+
 URL:            http://libsigc.sourceforge.net/
-Source0:        http://ftp.gnome.org/pub/GNOME/sources/libsigc++/2.0/libsigc++-%{version}.tar.bz2
+Source0:        http://ftp.gnome.org/pub/GNOME/sources/libsigc++/%{release_version}/libsigc++-%{version}.tar.bz2
 # fix compilation with GCC 4.6 (upstream ticket: GNOME BZ #641471)
 Patch0:         %{name}-gcc46.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@@ -96,6 +99,8 @@ rm -rf $RPM_BUILD_ROOT
 %changelog
 * Tue Mar 01 2011 Kalev Lember <kalev@smartlink.ee> - 2.2.8-4
 - Spec cleanup
+- Use macro for automatically calculating ftp directory name with
+  first two digits of tarball version.
 
 * Mon Feb 21 2011 Haïkel Guémar <hguemar@fedoraproject.org> - 2.2.8-3
 - fix documentation location (RHBZ #678981)