Include DPCT headers from system installation and remove the local copy

cmake/Finddpct.cmake

@@ -0,0 +1,35 @@
+if (WIN32)
+    find_path( dpct_INCLUDE_DIR
+        NAMES
+            dpct/dpct.hpp
+        PATHS
+            ${dpct_LOCATION}/include
+            $ENV{dpct_LOCATION}/include
+            $ENV{DPCT_BUNDLE_ROOT}/include
+            $ENV{ONEAPI_ROOT}/dpcpp-ct/latest/include
+            $ENV{PROGRAMFILES}/include
+            NO_DEFAULT_PATH
+            DOC "The directory where dpct/dpct.hpp resides"
+    )
+else()
+    find_path( dpct_INCLUDE_DIR
+        NAMES
+            dpct/dpct.hpp
+        PATHS
+            ${dpct_LOCATION}/include
+            $ENV{dpct_LOCATION}/include
+            $ENV{DPCT_BUNDLE_ROOT}/include
+            $ENV{ONEAPI_ROOT}/dpcpp-ct/latest/include
+            /opt/intel/oneapi/dpcpp-ct/latest/include
+            /usr/include
+            /usr/local/include
+            /sw/include
+            /opt/local/include
+            NO_DEFAULT_PATH
+            DOC "The directory where dpct/dpct.hpp resides"
+    )
+endif ()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args( dpct REQUIRED_VARS dpct_INCLUDE_DIR )
+

src_sycl/CMakeLists.txt

@@ -8,6 +8,7 @@ pkg_check_modules(Glew REQUIRED IMPORTED_TARGET glew)
 find_package(glm REQUIRED)
 find_package(glfw3 REQUIRED)
 find_package(OpenGL REQUIRED)
+find_package(dpct REQUIRED)
 
 set(COMMON_SOURCE 
 	nbody.cpp 
@@ -26,7 +27,7 @@ target_compile_definitions(${BINARY_NAME} PRIVATE -DUSE_OPENGL COMPILER_NAME="SY
 
 target_compile_features(${BINARY_NAME} PRIVATE cxx_auto_type cxx_nullptr cxx_range_for)
 
-target_include_directories(${BINARY_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include)
+target_include_directories(${BINARY_NAME} PRIVATE ${dpct_INCLUDE_DIRS})
 
 target_link_libraries(${BINARY_NAME} PRIVATE glm::glm glfw PkgConfig::Glew OpenGL::OpenGL)