diff --git a/qrencode.spec b/qrencode.spec
index 26da7b5..f55235b 100644
--- a/qrencode.spec
+++ b/qrencode.spec
@@ -1,11 +1,26 @@
+# Recent so-version, so we do not bump accidentally.
+%global so_ver      4
+
+# Set to 1 when building a bootstrap for a bumped so-name.
+%global bootstrap   1
+
+%if 0%{?bootstrap}
+%global version_old 3.4.4
+%global so_ver_old  3
+%endif
+
+
 Name:           qrencode
 Version:        4.0.2
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Generate QR 2D barcodes
 
 License:        LGPLv2+
 URL:            http://fukuchi.org/works/qrencode/
 Source0:        http://fukuchi.org/works/qrencode/qrencode-%{version}.tar.bz2
+%if 0%{?bootstrap}
+Source1:        http://fukuchi.org/works/qrencode/qrencode-%{version_old}.tar.bz2
+%endif
 
 BuildRequires:  gcc
 BuildRequires:  chrpath
@@ -18,6 +33,7 @@ BuildRequires:  autoconf >= 2.69
 Qrencode is a utility software using libqrencode to encode string data in
 a QR Code and save as a PNG image.
 
+
 %package        devel
 Summary:        QR Code encoding library - Development files
 Requires:       %{name}-libs%{?_isa} = %{version}-%{release}
@@ -34,8 +50,17 @@ Summary:        QR Code encoding library - Shared libraries
 The qrencode-libs package contains the shared libraries and header files for
 applications that use qrencode.
 
+
 %prep
-%autosetup
+%autosetup -Tb 0 -p 1
+
+%if 0%{?bootstrap}
+mkdir -p bootstrap_ver
+pushd bootstrap_ver
+tar --strip-components=1 -xf %{SOURCE1}
+popd
+%endif
+
 
 %build
 ## Rebuild configure scripts for ARM 64 support. (RHBZ 926414)
@@ -43,31 +68,60 @@ autoconf
 %configure --with-tests
 %make_build
 
+%if 0%{?bootstrap}
+pushd bootstrap_ver
+autoconf
+%configure --with-tests
+%make_build
+popd
+%endif
+
+
 %install
-%make_install INSTALL="install -p"
+%if 0%{?bootstrap}
+%make_install -C bootstrap_ver
+%{_bindir}/find %{buildroot} -xtype f -not            \
+  -name 'lib%{name}.so.%{so_ver_old}*' -delete -print
+%{_bindir}/find %{buildroot} -type l -not             \
+  -name 'lib%{name}.so.%{so_ver_old}*' -delete -print
+%endif
+
+%make_install
 rm -f %{buildroot}%{_libdir}/libqrencode.la
 chrpath --delete %{buildroot}%{_bindir}/qrencode
 
+
 %check
-cd ./tests
+pushd ./tests
 sh test_all.sh
+popd
+
 
 %files
 %{_bindir}/qrencode
 %{_mandir}/man1/qrencode.1*
 
+
 %files libs
 %{!?_licensedir:%global license %%doc}
 %license COPYING
 %doc ChangeLog NEWS README TODO
-%{_libdir}/libqrencode.so.*
+%{_libdir}/libqrencode.so.%{so_ver}*
+%if 0%{?bootstrap}
+%{_libdir}/libqrencode.so.%{so_ver_old}*
+%endif
+
 
 %files devel
 %{_includedir}/qrencode.h
 %{_libdir}/libqrencode.so
 %{_libdir}/pkgconfig/libqrencode.pc
 
+
 %changelog
+* Tue Jun 25 2019 Björn Esser <besser82@fedoraproject.org> - 4.0.2-2
+- Implement bootstrap logic for so-name bumps
+
 * Tue Jun 25 2019 Paul Wouters <pwouters@redhat.com> - 4.0.2-1
 - Update to 4.0.2 and cleanup by Vasiliy N. Glazov <vascom2@gmail.com>