diff --git a/slirp4netns.spec b/slirp4netns.spec
index 5aa41ad..9f70358 100644
--- a/slirp4netns.spec
+++ b/slirp4netns.spec
@@ -1,28 +1,18 @@
-%global built_tag_strip 1.2.0
+%global built_tag v1.2.0
+%global built_tag_strip %(b=%{built_tag}; echo ${b:1})
+%global gen_version %(b=%{built_tag_strip}; echo ${b/-/"~"})
 
 Name: slirp4netns
-Version: 1.2.0
-%if "%{_vendor}" == "debbuild"
-Packager: Podman Debbuild Maintainers <https://github.com/orgs/containers/teams/podman-debbuild-maintainers>
-License: GPL-2.0+
-Release: 0%{?dist}
-%else
+Version: %{gen_version}
 Release: %autorelease
 License: GPLv2
-%endif
 Summary: slirp for network namespaces
 URL: https://github.com/rootless-containers/%{name}
-Source0: %{url}/archive/v%{built_tag_strip}.tar.gz
+# Tarball fetched from upstream
+Source0: %{url}/archive/%{built_tag}.tar.gz
 BuildRequires: autoconf
 BuildRequires: automake
 BuildRequires: go-md2man
-%if "%{_vendor}" == "debbuild"
-BuildRequires: git
-BuildRequires: libglib2.0-dev
-BuildRequires: libcap-dev
-BuildRequires: libseccomp-dev
-BuildRequires: libslirp-dev
-%else
 BuildRequires: gcc
 BuildRequires: glib2-devel
 BuildRequires: git-core
@@ -30,7 +20,6 @@ BuildRequires: libcap-devel
 BuildRequires: libseccomp-devel
 BuildRequires: libslirp-devel
 BuildRequires: make
-%endif
 
 %description
 slirp for network namespaces, without copying buffers across the namespaces.
@@ -69,6 +58,4 @@ make DESTDIR=%{buildroot} install install-man
 %{_mandir}/man1/%{name}.1.gz
 
 %changelog
-%if "%{_vendor}" != "debbuild"
 %autochangelog
-%endif