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
@@ -148,6 +148,8 @@
 ${CMAKE} --version
 ${NINJA} --version
 
+if [ ! -z "${CXX}" ]; then ${CXX} --version; fi
+
 case "${BUILDER}" in
 check-format)
     clean