fix build

.github/workflows/rust.yml

@@ -21,12 +21,14 @@ jobs:
           CC: clang
         run: |
           url="https://cache.ruby-lang.org/pub/ruby/3.4/ruby-3.4.4.tar.gz"
+          prefix=`pwd`/rubies/ruby-3.4
+          mkdir rubies
           mkdir ruby_src
           curl -sSL $url | tar -xz --directory=./ruby_src
           cd ruby_src
-          mkdir build && cd build
-          mkdir rubies
-          ../configure --without-shared --prefix="${pwd}/rubies/ruby-3.4"
+          mkdir build
+          cd build
+          ../configure --without-shared --prefix=`prefix`
           make install
           echo `pwd`/rubies/ruby-3.4/ruby/bin >> $GITHUB_PATH
       - name: Clippy