diff --git a/CI/azure/check_README_BUILD.sh b/CI/azure/check_README_BUILD.sh
new file mode 100755
index 000000000..1d680f433
--- /dev/null
+++ b/CI/azure/check_README_BUILD.sh
@@ -0,0 +1,34 @@
+#!/bin/sh
+
+# Check the project CMake for options, which are not described in the README_BUILD.md file
+# At the same time, check to make sure the defaults are described properly.
+
+error=0
+
+options() {
+	for file in $(find ./ -not \( -path ./deps -prune \) -name CMakeLists.txt)
+	do
+		grep option[[:space:]]*\( "${file}" | \
+			sed -e "s/^[[:space:]]*//g" -e "s/(/ /g" | \
+			awk '{print $2}'
+	done | sort | uniq 
+}
+
+for opt in $(options)
+do
+	default=$(for file in $(find ./ -not \( -path ./deps -prune \) -name CMakeLists.txt)
+	do
+		grep "option[[:space:]]*(${opt} " "${file}" | \
+			sed -e "s/^[[:space:]]*//g" -e "s/)[[:space:]]*$//" | \
+			awk '{print $NF}'
+	done)
+	if ! grep -q "${opt}.*${default}" README_BUILD.md ; then
+		echo "no match with ${opt} set with ${default}"
+		grep -R "${opt}" ./*
+		error=1
+	fi
+done
+
+if [ "${error}" -eq "1" ] ; then
+	exit 1
+fi
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 0c07f00e4..bb3c5d8b2 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -67,6 +67,9 @@ stages:
     - script: ./CI/azure/check_kernel.sh
       displayName: 'Kernel check'
       condition: and(eq(variables['artifactName'], 'Linux-Ubuntu-22.04'), eq(variables['Build.Reason'], 'PullRequest'))
+    - script: ./CI/azure/check_README_BUILD.sh
+      displayName: 'README_BUILD check'
+      condition: and(eq(variables['artifactName'], 'Linux-Ubuntu-22.04'), eq(variables['Build.Reason'], 'PullRequest'))
     - task: PublishPipelineArtifact@1
       inputs:
         targetPath: '$(Build.ArtifactStagingDirectory)'