diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 90c624f3..874326b7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -58,7 +58,7 @@ jobs:
           prefix: /opt
 
       - name: sanitize macOS runners
-        if: matrix.platform.os == 'macos-11'
+        if: fromJson(needs.get-platform.outputs.build-os) == 'macos-11'
         run: sudo mv /usr/local/bin/* /tmp/
 
       - name: configure tea env
diff --git a/projects/ruby-lang.org/package.yml b/projects/ruby-lang.org/package.yml
index c614c629..150cdfd2 100644
--- a/projects/ruby-lang.org/package.yml
+++ b/projects/ruby-lang.org/package.yml
@@ -20,7 +20,7 @@ build:
   script: |
     patch -p1 < props/mkconfig.rb.diff
 
-    ./configure --prefix="{{prefix}}" --enable-load-relative --disable-rubygems
+    ./configure --prefix="{{prefix}}" --enable-load-relative --disable-rubygems --without-gmp
     make --jobs {{hw.concurrency}} install
 
     cd "{{prefix}}/bin"