SAL fix

Author: walbourn

SHMath/CMakeLists.txt

@@ -217,3 +217,16 @@ elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
         target_compile_options(${PROJECT_NAME} PRIVATE $<$<VERSION_GREATER_EQUAL:${CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION},10.0.22000>:/Zc:templateScope>)
     endif()
 endif()
+
+if(NOT WIN32)
+    include(FetchContent)
+    FetchContent_Declare(
+        salheaderforsh
+        URL https://raw.githubusercontent.com/dotnet/runtime/v9.0.2/src/coreclr/pal/inc/rt/sal.h
+        URL_HASH SHA512=8085f67bfa4ce01ae89461cadf72454a9552fde3f08b2dcc3de36b9830e29ce7a6192800f8a5cb2a66af9637be0017e85719826a4cfdade508ae97f319e0ee8e
+        DOWNLOAD_NO_EXTRACT ON
+    )
+    FetchContent_MakeAvailable(salheaderforsh)
+
+    target_include_directories(${PROJECT_NAME} PRIVATE ${salheaderforsh_SOURCE_DIR})
+endif()