Update ci.yml

Author: mcbarton

.github/workflows/ci.yml

@@ -299,10 +299,11 @@ jobs:
                 brew install llvm@15
                 brew remove llvm@18
                 brew cleanup
-                export LDFLAGS="-L/opt/homebrew/opt/llvm@15/lib/ -L/opt/homebrew/opt/llvm@15/c++/" >> $GITHUB_ENV
-                export CPPFLAGS="-I/opt/homebrew/opt/llvm@15/include" >> $GITHUB_ENV
-                export CPATH="/opt/homebrew/include/" >> $GITHUB_ENV
-                export LIBRARY_PATH="/opt/homebrew/lib/" >> $GITHUB_ENV
+                echo 'LDFLAGS="-L/opt/homebrew/opt/llvm@15/lib/ -L/opt/homebrew/opt/llvm@15/c++/"' >> $GITHUB_ENV
+                echo 'CPPFLAGS="-I/opt/homebrew/opt/llvm@15/include"' >> $GITHUB_ENV
+                echo 'CPATH="/opt/homebrew/include/"' >> $GITHUB_ENV
+                echo "LIBRARY_PATH="/opt/homebrew/lib/"' >> $GITHUB_ENV
+                echo 'DEVELOPER_DIR=/Applications/Xcode_15.4.app/Contents/Developer/' >> $GITHUB_ENV
                 echo "CC=$(brew --prefix llvm@15)/bin/clang" >> $GITHUB_ENV
                 echo "CXX=$(brew --prefix llvm@15)/bin/clang++" >> $GITHUB_ENV
             else
@@ -785,10 +786,11 @@ jobs:
                 brew install llvm@15
                 brew remove llvm@18
                 brew cleanup
-                export LDFLAGS="-L/opt/homebrew/opt/llvm@15/lib/ -L/opt/homebrew/opt/llvm@15/c++/ " >> $GITHUB_ENV
-                export CPPFLAGS="-I/opt/homebrew/opt/llvm@15/include" >> $GITHUB_ENV
-                export CPATH="/opt/homebrew/include/" >> $GITHUB_ENV
-                export LIBRARY_PATH="/opt/homebrew/lib/" >> $GITHUB_ENV
+                echo 'LDFLAGS="-L/opt/homebrew/opt/llvm@15/lib/ -L/opt/homebrew/opt/llvm@15/c++/"' >> $GITHUB_ENV
+                echo 'CPPFLAGS="-I/opt/homebrew/opt/llvm@15/include"' >> $GITHUB_ENV
+                echo 'CPATH="/opt/homebrew/include/"' >> $GITHUB_ENV
+                echo "LIBRARY_PATH="/opt/homebrew/lib/"' >> $GITHUB_ENV
+                echo 'DEVELOPER_DIR=/Applications/Xcode_15.4.app/Contents/Developer/' >> $GITHUB_ENV
                 echo "CC=$(brew --prefix llvm@15)/bin/clang" >> $GITHUB_ENV
                 echo "CXX=$(brew --prefix llvm@15)/bin/clang++" >> $GITHUB_ENV
             else