Try $env:IncludePath

Author: mcbarton

.github/actions/Build_and_Test_CppInterOp/action.yml

@@ -91,15 +91,15 @@ runs:
           echo "CLING_BUILD_DIR=$env:CLING_BUILD_DIR"
           echo "CLING_BUILD_DIR=$env:CLING_BUILD_DIR" >> $env:GITHUB_ENV
 
-          $env:CPLUS_INCLUDE_PATH="$env:CLING_DIR\tools\cling\include;$env:CLING_BUILD_DIR\include;$env:LLVM_DIR\llvm\include;$env:LLVM_DIR\clang\include;$env:LLVM_BUILD_DIR\include;$env:LLVM_BUILD_DIR\tools\clang\include;$env:PWD_DIR\include"
-          echo "CPLUS_INCLUDE_PATH=$env:CPLUS_INCLUDE_PATH"
-          echo "CPLUS_INCLUDE_PATH=$env:CPLUS_INCLUDE_PATH" >> $env:GITHUB_ENV
+          $env:IncludePath="$env:IncludePath;$env:CLING_DIR\tools\cling\include;$env:CLING_BUILD_DIR\include;$env:LLVM_DIR\llvm\include;$env:LLVM_DIR\clang\include;$env:LLVM_BUILD_DIR\include;$env:LLVM_BUILD_DIR\tools\clang\include;$env:PWD_DIR\include;"
+          echo "IncludePath=$env:IncludePath"
+          echo "IncludePath=$env:IncludePath" >> $env:GITHUB_ENV
         }
         else
         {
-          $env:CPLUS_INCLUDE_PATH="$env:LLVM_DIR\llvm\include;$env:LLVM_DIR\clang\include;$env:LLVM_BUILD_DIR\include;$env:LLVM_BUILD_DIR\tools\clang\include;$env:PWD_DIR\include"
-          echo "CPLUS_INCLUDE_PATH=$env:CPLUS_INCLUDE_PATH"
-          echo "CPLUS_INCLUDE_PATH=$env:CPLUS_INCLUDE_PATH" >> $env:GITHUB_ENV
+          $env:IncludePath="$env:IncludePath;$env:LLVM_DIR\llvm\include;$env:LLVM_DIR\clang\include;$env:LLVM_BUILD_DIR\include;$env:LLVM_BUILD_DIR\tools\clang\include;$env:PWD_DIR\include;"
+          echo "IncludePath=$env:IncludePath"
+          echo "IncludePath=$env:IncludePath" >> $env:GITHUB_ENV
         }
 
         $env:CB_PYTHON_DIR="$env:PWD_DIR\cppyy-backend\python"