diff --git a/libcxx/utils/ci/buildkite-pipeline.yml b/libcxx/utils/ci/buildkite-pipeline.yml
--- a/libcxx/utils/ci/buildkite-pipeline.yml
+++ b/libcxx/utils/ci/buildkite-pipeline.yml
@@ -135,6 +135,19 @@
         - exit_status: -1  # Agent was lost
           limit: 2
 
+  - label: "GCC-next/C++20"
+    command: "libcxx/utils/ci/run-buildbot generic-gcc-next"
+    artifact_paths:
+      - "**/test-results.xml"
+    agents:
+      queue: "libcxx-builders"
+    retry:
+      automatic:
+        - exit_status: -1  # Agent was lost
+          limit: 2
+    soft_fail:
+      - exit_status: 1
+
   #
   # All other supported configurations of libc++.
   #
diff --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -270,6 +270,13 @@
     generate-cmake
     check-cxx-cxxabi
 ;;
+generic-gcc-next)
+    export CC=gcc-11
+    export CXX=g++-11
+    clean
+    generate-cmake
+    check-cxx-cxxabi
+;;
 generic-asan)
     export CC=clang
     export CXX=clang++