diff --git a/src/bootstrap/src/core/build_steps/gcc.rs b/src/bootstrap/src/core/build_steps/gcc.rs
index d07b7d256678..9de5fdc5d959 100644
--- a/src/bootstrap/src/core/build_steps/gcc.rs
+++ b/src/bootstrap/src/core/build_steps/gcc.rs
@@ -117,14 +117,14 @@ impl Step for Gcc {
 
         // Download dependencies into the build directory, to avoid modifying the source directory
         // The configure script should automatically find them in the build directory
-        // command(root.join("contrib/download_prerequisites"))
-        // The script sadly tries to write symlinks to the source directory, even if we
-        // actually download the dependencies elsewhere.
-        // .allow_failure()
-        // .current_dir(&root)
-        // .arg("--directory")
-        // .arg(&deps_dir)
-        // .run(builder);
+        command(root.join("contrib/download_prerequisites"))
+            // The script sadly tries to write symlinks to the source directory, even if we
+            // actually download the dependencies elsewhere.
+            // .allow_failure()
+            .current_dir(&root)
+            // .arg("--directory")
+            // .arg(&deps_dir)
+            .run(builder);
 
         let mut configure_cmd = command(root.join("configure"));
         configure_cmd
diff --git a/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile b/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
index 93f426ba5685..a42f693c6961 100644
--- a/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
@@ -35,9 +35,6 @@ RUN yum upgrade -y && \
       unzip \
       wget \
       xz \
-      gmp-devel \
-      mpfr-devel \
-      mpc-devel \
       zlib-devel.i686 \
       zlib-devel.x86_64 \
       && yum clean all
diff --git a/src/ci/github-actions/jobs.yml b/src/ci/github-actions/jobs.yml
index 876a77935921..2ded8b334b6a 100644
--- a/src/ci/github-actions/jobs.yml
+++ b/src/ci/github-actions/jobs.yml
@@ -113,6 +113,7 @@ try:
   - image: dist-x86_64-linux
     env:
       CODEGEN_BACKENDS: llvm,cranelift
+      READ_ONLY_SRC: "0"
     <<: *job-linux-16c
 
 # Main CI jobs that have to be green to merge a commit into master