diff --git a/.gitignore b/.gitignore
index b9c60ac..2983f22 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,3 +25,8 @@ bin
 
 # Release manifests
 /release/infrastructure-components.yaml
+
+# Temporary cluster-api clone for building clusterctl
+# TODO: remove this when the GCP auth provider is supported
+#https://github.com/kubernetes-sigs/cluster-api/pull/2684
+/cluster-api/
diff --git a/README.md b/README.md
index e1ae145..e6f3dde 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,13 @@ kubectl apply -f hack/forward-ipencap.yaml
 ### Installation
 
 ```sh
+# Install clusterctl
+# https://github.com/kubernetes-sigs/cluster-api/pull/2684
+git clone --single-branch --branch add-gcp-auth-provider-support https://github.com/dippynark/cluster-api
+cd cluster-api
+go build -ldflags "$(hack/version.sh)" -o bin/clusterctl ./cmd/clusterctl
+export PATH=$PWD/bin:$PATH
+
 # Add the Kubernetes infrastructure provider
 mkdir -p $HOME/.cluster-api
 cat > $HOME/.cluster-api/clusterctl.yaml <<EOF