diff --git a/spack.changes b/spack.changes
index 8601ecb..f188da6 100644
--- a/spack.changes
+++ b/spack.changes
@@ -20,6 +20,10 @@ Fri Mar 15 13:35:51 UTC 2024 - Egbert Eich <eich@suse.com>
     + `rust`: add v1.75, rework a few variants.
     + `py-transformers`: add v4.35.2.
 - Fix path to setup-env.sh in the Apptainer template (bsc#1221471).
+- Add libgfortran, libfl2 and libzip5 to the Spack runtime
+  container as the Spack build container has the corresponding
+  devel packages but these libraries are not installed in a
+  BCI-style base container by default (bsc#1221503).
 
 -------------------------------------------------------------------
 Fri Feb  2 14:41:14 UTC 2024 - Egbert Eich <eich@suse.com>
diff --git a/spack.spec b/spack.spec
index 2391e72..f7b1777 100644
--- a/spack.spec
+++ b/spack.spec
@@ -29,6 +29,16 @@ ExclusiveArch:  do_not_build
 
 %define spack_dir  %_prefix/lib/spack/
 %define spack_group spack
+# These packages are missing from a BCI-style base container but may
+# be used by Spack for building. To avoid unresolved libraries, make
+# sure these are installed in the runtime container.
+%if 0%{suse_version} == 1500
+%define spack_container_packages libgfortran4 libfl2 libzip5
+%else
+%if 0%{suse_version} >  1600
+%define spack_container_packages libgfortran5 libfl2 libzip5
+%endif
+%endif
 
 # These packages are found and can be used by spack, %{_sysconfdir}/spack/packages-yaml
 # needs to be updated when one of these packages is updated or uninstalled.
@@ -324,8 +334,10 @@ chmod 0755 %{buildroot}%{_bindir}/%{basename:%{S:6}}
 cp etc/spack/defaults/config.yaml %{buildroot}%{_sysconfdir}/skel/.spack/
 install -m 755 %{S:3} %{buildroot}/%{spack_dir}/run-find-external.sh
 sed -i -e 's#@@_sysconfdir@@#%{_sysconfdir}#' %{buildroot}/%{spack_dir}/run-find-external.sh
-sed -i -e '/. \/opt/s#/opt/spack/#/usr/share/#' %{buildroot}/%{_datarootdir}/spack/templates/container/singularity.def
-
+sed -i -e '/. \/opt/s#/opt/spack/#/usr/#' %{buildroot}/%{_datarootdir}/spack/templates/container/singularity.def
+%{?spack_container_packages:
+sed -i -e 's/\(zypper update -y\)/\1 \&\& zypper -n in -y %{spack_container_packages}/' \
+					     %{buildroot}%{spack_dir}/spack/container/images.json}
 # Make spack only to write to home dir of user, if run as user
 sed -i 's@\(\sroot:\) /opt/spack@\1 ~/spack/packages@' %{buildroot}%{_sysconfdir}/skel/.spack/config.yaml
 sed -i 's@\(\ssource_cache:\).*@\1 /var/tmp/$user/spack-cache@' %{buildroot}%{_sysconfdir}/skel/.spack/config.yaml