diff --git a/abseil-cpp.spec b/abseil-cpp.spec
index 1914e86..73c8f05 100644
--- a/abseil-cpp.spec
+++ b/abseil-cpp.spec
@@ -65,6 +65,18 @@ BuildRequires:  gcc-c++
 BuildRequires:  gmock-devel
 BuildRequires:  gtest-devel
 
+# The contents of absl/time/internal/cctz are derived from
+# https://github.com/google/cctz (https://src.fedoraproject.org/rpms/cctz), but
+# have been forked with Abseil-specific changes. It is not obvious from which
+# particular version of CCTZ these sources are derived. Upstream was asked
+# about a path to supporting a system copy as required by bundling guidelines:
+#   Please comment on CCTZ bundling
+#   https://github.com/abseil/abseil-cpp/discussions/1415
+# They refused, for the time being, as follows:
+#   “[…] we have no plans to change this decision, but we reserve the right to
+#   change our minds.”
+Provides:       bundled(cctz)
+
 %ifarch s390x
 # Symbolize.SymbolizeWithMultipleMaps fails in absl_symbolize_test on s390x
 # with LTO
@@ -91,6 +103,10 @@ and we now want to provide those resources to the C++ community as a whole.
 Summary: Development files for %{name}
 Requires: %{name}%{?_isa} = %{version}-%{release}
 
+# Some of the headers from CCTZ are part of the -devel subpackage. See the
+# corresponding virtual Provides in the base package for full details.
+Provides:       bundled(cctz)
+
 %description devel
 Development headers for %{name}
 
@@ -140,6 +156,7 @@ find . -type f -name '*.cc' \
 %changelog
 * Sat Jan 25 2025 Benjamin A. Beasley <code@musicinmybrain.net> - 20211102.0-4
 - Update License to SPDX
+- Indicate CCTZ bundling
 
 * Fri Jul 29 2022 Benjamin A. Beasley <code@musicinmybrain.net> - 20211102.0-3
 - Do not leak -maes -msse4.1 into pkgconfig (fix RHBZ#2108658)