diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index a01c0310e72..00000000000
--- a/.gitmodules
+++ /dev/null
@@ -1,8 +0,0 @@
-[submodule "thirdparty/jitify"]
-	path = thirdparty/jitify
-	url = https://github.com/rapidsai/jitify.git
-	branch = cudf_0.14
-[submodule "thirdparty/libcudacxx"]
-	path = thirdparty/libcudacxx
-	url = https://github.com/rapidsai/thirdparty-freestanding.git
-	branch = cudf
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fe0b762b7a8..4c556052082 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,7 +17,8 @@
 
 - PR #5403 Update required CMake version to 3.14 in contribution guide
 - PR #5245 Add column reduction benchmark
-- PR #5315 Use CMake `FetchContent` to obtain latest release of `cub` and `thrust`
+- PR #5315 Use CMake `FetchContent` to obtain `cub` and `thrust`
+- PR #5398 Use CMake `FetchContent` to obtain `jitify` and `libcudacxx`
 - PR #5268 Rely on NumPy arrays for out-of-band pickling
 - PR #5288 Drop `auto_pickle` decorator #5288
 - PR #5231 Type `Buffer` as `uint8`
diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index 50d060e7a56..7fa242fa11f 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -195,18 +195,13 @@ else()
 endif(ARROW_FOUND)
 
 ###################################################################################################
-# - clone libcu++ ------------------------------------------------------------------------------------
-
-message(STATUS "Installing libcu++")
-execute_process(WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
-                COMMAND git clone --branch cudf --recurse-submodules
-                        https://github.com/rapidsai/thirdparty-freestanding.git libcudacxx)
+# - copy libcu++ ------------------------------------------------------------------------------------
 
 file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/include/libcudacxx")
 file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/include/libcxx/include")
 
-file(INSTALL ${CMAKE_BINARY_DIR}/libcudacxx/include/        DESTINATION include/libcudacxx)
-file(INSTALL ${CMAKE_BINARY_DIR}/libcudacxx/libcxx/include/ DESTINATION include/libcxx/include)
+file(INSTALL ${LIBCUDACXX_INCLUDE_DIR} DESTINATION ${CMAKE_BINARY_DIR}/include/libcudacxx/)
+file(INSTALL ${LIBCXX_INCLUDE_DIR}     DESTINATION ${CMAKE_BINARY_DIR}/include/libcxx/include/)
 
 ###################################################################################################
 # - find zlib -------------------------------------------------------------------------------------
@@ -332,7 +327,9 @@ message(STATUS "BENCHMARK_LIST set to: ${BENCHMARK_LIST}")
 # - include paths ---------------------------------------------------------------------------------
 
 include_directories("${CUB_INCLUDE_DIR}"
-                    "${THRUST_INCLUDE_DIR}")
+                    "${THRUST_INCLUDE_DIR}"
+                    "${JITIFY_INCLUDE_DIR}"
+                    "${LIBCUDACXX_INCLUDE_DIR}")
 
 if(CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES)
 	include_directories("${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES}")
@@ -342,8 +339,6 @@ include_directories("${CMAKE_BINARY_DIR}/include"
                     "${CMAKE_BINARY_DIR}/include/jit"
                     "${CMAKE_SOURCE_DIR}/include"
                     "${CMAKE_SOURCE_DIR}/src"
-                    "${CMAKE_SOURCE_DIR}/thirdparty/jitify"
-                    "${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include"
                     "${ARROW_INCLUDE_DIR}"
                     "${FLATBUFFERS_INCLUDE_DIR}"
                     "${ZLIB_INCLUDE_DIRS}"
@@ -574,7 +569,7 @@ set_target_properties(cudf PROPERTIES BUILD_RPATH "\$ORIGIN")
 # - jitify ----------------------------------------------------------------------------------------
 
 # Creates executable stringify and uses it to convert types.h to c-str for use in JIT code
-add_executable(stringify "${CMAKE_SOURCE_DIR}/thirdparty/jitify/stringify.cpp")
+add_executable(stringify "${JITIFY_INCLUDE_DIR}/stringify.cpp")
 execute_process(WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
     COMMAND ${CMAKE_COMMAND} -E make_directory
         ${CMAKE_BINARY_DIR}/include/jit
@@ -609,22 +604,22 @@ add_custom_command(WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include
                                    ${CMAKE_CURRENT_SOURCE_DIR}/include/cudf/types.hpp
                                    ${CMAKE_CURRENT_SOURCE_DIR}/include/cudf/utilities/bit.hpp
                                    ${CMAKE_CURRENT_SOURCE_DIR}/include/cudf/wrappers/timestamps.hpp
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include/details/__config
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include/simt/limits
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include/simt/cfloat
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include/simt/chrono
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include/simt/ctime
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include/simt/ratio
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include/simt/type_traits
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include/simt/version
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/libcxx/include/__config
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/libcxx/include/__undef_macros
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/libcxx/include/cfloat
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/libcxx/include/chrono
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/libcxx/include/ctime
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/libcxx/include/limits
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/libcxx/include/ratio
-                                   ${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/libcxx/include/type_traits
+                                   ${LIBCUDACXX_INCLUDE_DIR}/details/__config
+                                   ${LIBCUDACXX_INCLUDE_DIR}/simt/limits
+                                   ${LIBCUDACXX_INCLUDE_DIR}/simt/cfloat
+                                   ${LIBCUDACXX_INCLUDE_DIR}/simt/chrono
+                                   ${LIBCUDACXX_INCLUDE_DIR}/simt/ctime
+                                   ${LIBCUDACXX_INCLUDE_DIR}/simt/ratio
+                                   ${LIBCUDACXX_INCLUDE_DIR}/simt/type_traits
+                                   ${LIBCUDACXX_INCLUDE_DIR}/simt/version
+                                   ${LIBCXX_INCLUDE_DIR}/__config
+                                   ${LIBCXX_INCLUDE_DIR}/__undef_macros
+                                   ${LIBCXX_INCLUDE_DIR}/cfloat
+                                   ${LIBCXX_INCLUDE_DIR}/chrono
+                                   ${LIBCXX_INCLUDE_DIR}/ctime
+                                   ${LIBCXX_INCLUDE_DIR}/limits
+                                   ${LIBCXX_INCLUDE_DIR}/ratio
+                                   ${LIBCXX_INCLUDE_DIR}/type_traits
 
                    # stringified headers are placed underneath the bin include jit directory and end in ".jit"
                    COMMAND ${CMAKE_BINARY_DIR}/stringify cudf/types.h > ${CMAKE_BINARY_DIR}/include/jit/types.h.jit
@@ -632,22 +627,22 @@ add_custom_command(WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include
                    COMMAND ${CMAKE_BINARY_DIR}/stringify cudf/utilities/bit.hpp > ${CMAKE_BINARY_DIR}/include/bit.hpp.jit
                    COMMAND ${CMAKE_BINARY_DIR}/stringify ../src/rolling/rolling_jit_detail.hpp > ${CMAKE_BINARY_DIR}/include/rolling_jit_detail.hpp.jit
                    COMMAND ${CMAKE_BINARY_DIR}/stringify cudf/wrappers/timestamps.hpp > ${CMAKE_BINARY_DIR}/include/jit/timestamps.hpp.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/include/details/__config libcudacxx_details_config > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/details/__config.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/include/simt/limits libcudacxx_simt_limits > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/limits.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/include/simt/cfloat libcudacxx_simt_cfloat > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/cfloat.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/include/simt/chrono libcudacxx_simt_chrono > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/chrono.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/include/simt/ctime libcudacxx_simt_ctime > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/ctime.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/include/simt/ratio libcudacxx_simt_ratio > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/ratio.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/include/simt/type_traits libcudacxx_simt_type_traits > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/type_traits.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/include/version libcudacxx_simt_version > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/version.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/libcxx/include/__config libcxx_config > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/__config.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/libcxx/include/__undef_macros libcxx_undef_macros > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/__undef_macros.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/libcxx/include/cfloat libcxx_cfloat > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/cfloat.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/libcxx/include/chrono libcxx_chrono > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/chrono.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/libcxx/include/ctime libcxx_ctime > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/ctime.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/libcxx/include/limits libcxx_limits > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/limits.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/libcxx/include/ratio libcxx_ratio > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/ratio.jit
-                   COMMAND ${CMAKE_BINARY_DIR}/stringify ../../thirdparty/libcudacxx/libcxx/include/type_traits libcxx_type_traits > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/type_traits.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCUDACXX_INCLUDE_DIR}/details/__config libcudacxx_details_config > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/details/__config.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCUDACXX_INCLUDE_DIR}/simt/limits libcudacxx_simt_limits > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/limits.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCUDACXX_INCLUDE_DIR}/simt/cfloat libcudacxx_simt_cfloat > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/cfloat.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCUDACXX_INCLUDE_DIR}/simt/chrono libcudacxx_simt_chrono > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/chrono.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCUDACXX_INCLUDE_DIR}/simt/ctime libcudacxx_simt_ctime > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/ctime.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCUDACXX_INCLUDE_DIR}/simt/ratio libcudacxx_simt_ratio > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/ratio.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCUDACXX_INCLUDE_DIR}/simt/type_traits libcudacxx_simt_type_traits > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/type_traits.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCUDACXX_INCLUDE_DIR}/version libcudacxx_simt_version > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/simt/version.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCXX_INCLUDE_DIR}/__config libcxx_config > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/__config.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCXX_INCLUDE_DIR}/__undef_macros libcxx_undef_macros > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/__undef_macros.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCXX_INCLUDE_DIR}/cfloat libcxx_cfloat > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/cfloat.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCXX_INCLUDE_DIR}/chrono libcxx_chrono > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/chrono.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCXX_INCLUDE_DIR}/ctime libcxx_ctime > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/ctime.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCXX_INCLUDE_DIR}/limits libcxx_limits > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/limits.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCXX_INCLUDE_DIR}/ratio libcxx_ratio > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/ratio.jit
+                   COMMAND ${CMAKE_BINARY_DIR}/stringify ${LIBCXX_INCLUDE_DIR}/type_traits libcxx_type_traits > ${CMAKE_BINARY_DIR}/include/jit/libcudacxx/libcxx/include/type_traits.jit
                    )
 
 add_custom_target(stringify_run DEPENDS
diff --git a/cpp/benchmarks/CMakeLists.txt b/cpp/benchmarks/CMakeLists.txt
index c31d8a49779..3a7674677a3 100644
--- a/cpp/benchmarks/CMakeLists.txt
+++ b/cpp/benchmarks/CMakeLists.txt
@@ -24,14 +24,18 @@ endfunction(ConfigureBench)
 
 include_directories("${CUB_INCLUDE_DIR}"
                     "${THRUST_INCLUDE_DIR}"
-                    "${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES}"
-                    "${CMAKE_BINARY_DIR}/include"
+                    "${JITIFY_INCLUDE_DIR}"
+                    "${LIBCUDACXX_INCLUDE_DIR}")
+
+if(CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES)
+    include_directories("${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES}")
+endif(CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES)
+                  
+include_directories("${CMAKE_BINARY_DIR}/include"
                     "${CMAKE_SOURCE_DIR}/include"
                     "${CMAKE_SOURCE_DIR}"
                     "${CMAKE_SOURCE_DIR}/src"
                     "${CMAKE_SOURCE_DIR}/thirdparty/dlpack/include"
-                    "${CMAKE_SOURCE_DIR}/thirdparty/jitify"
-                    "${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include"
                     "${GTEST_INCLUDE_DIR}"
                     "${GBENCH_INCLUDE_DIR}"
                     "${ARROW_INCLUDE_DIR}"
diff --git a/cpp/tests/CMakeLists.txt b/cpp/tests/CMakeLists.txt
index 98e26ab3cfa..f8ca33b8432 100644
--- a/cpp/tests/CMakeLists.txt
+++ b/cpp/tests/CMakeLists.txt
@@ -59,7 +59,9 @@ endfunction(ConfigureTest)
 # - include paths ---------------------------------------------------------------------------------
 
 include_directories("${CUB_INCLUDE_DIR}"
-                    "${THRUST_INCLUDE_DIR}")
+                    "${THRUST_INCLUDE_DIR}"
+                    "${JITIFY_INCLUDE_DIR}"
+                    "${LIBCUDACXX_INCLUDE_DIR}")
 
 if(CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES)
     include_directories("${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES}")
@@ -69,9 +71,7 @@ include_directories("${CMAKE_BINARY_DIR}/include"
                     "${CMAKE_SOURCE_DIR}/include"
                     "${CMAKE_SOURCE_DIR}"
                     "${CMAKE_SOURCE_DIR}/src"
-                    "${CMAKE_SOURCE_DIR}/thirdparty/jitify"
                     "${CMAKE_SOURCE_DIR}/thirdparty/dlpack/include"
-                    "${CMAKE_SOURCE_DIR}/thirdparty/libcudacxx/include"
                     "${GTEST_INCLUDE_DIR}"
                     "${ARROW_INCLUDE_DIR}"
                     "${FLATBUFFERS_INCLUDE_DIR}"
diff --git a/python/cudf/setup.py b/python/cudf/setup.py
index 8fcf45d7c0d..cad620952d2 100644
--- a/python/cudf/setup.py
+++ b/python/cudf/setup.py
@@ -31,6 +31,8 @@
 
 cuda_include_dir = os.path.join(CUDA_HOME, "include")
 
+CUDF_ROOT = os.environ.get("CUDF_ROOT", "../../cpp/build/")
+
 try:
     nthreads = int(os.environ.get("PARALLEL_LEVEL", "0") or "0")
 except Exception:
@@ -43,10 +45,12 @@
         include_dirs=[
             "../../cpp/include/cudf",
             "../../cpp/include",
-            "../../cpp/build/include",
-            "../../cpp/build/_deps/cub-src",
-            "../../cpp/build/_deps/thrust-src",
-            "../../thirdparty/libcudacxx/include",
+            os.path.join(CUDF_ROOT, "include"),
+            os.path.join(CUDF_ROOT, "_deps/libcudacxx-src/include"),
+            os.path.join(
+                os.path.dirname(sysconfig.get_path("include")),
+                "libcudf/libcudacxx",
+            ),
             os.path.dirname(sysconfig.get_path("include")),
             np.get_include(),
             cuda_include_dir,
diff --git a/thirdparty/CMakeLists.txt b/thirdparty/CMakeLists.txt
index 7f16a1df397..671dec44ae4 100644
--- a/thirdparty/CMakeLists.txt
+++ b/thirdparty/CMakeLists.txt
@@ -3,6 +3,8 @@ include(FetchContent)
 ###################################################################################################
 # - cub -------------------------------------------------------------------------------------------
 
+message("Fetching CUB")
+
 FetchContent_Declare(
     cub
     GIT_REPOSITORY https://github.com/thrust/cub.git
@@ -23,6 +25,8 @@ set(CUB_INCLUDE_DIR "${cub_SOURCE_DIR}" PARENT_SCOPE)
 ###################################################################################################
 # - thrust ----------------------------------------------------------------------------------------
 
+message("Fetching Thrust")
+
 FetchContent_Declare(
     thrust
     GIT_REPOSITORY https://github.com/thrust/thrust.git
@@ -36,3 +40,44 @@ if(NOT thrust_POPULATED)
   # We are not using the thrust CMake targets, so no need to call `add_subdirectory()`.
 endif()
 set(THRUST_INCLUDE_DIR "${thrust_SOURCE_DIR}" PARENT_SCOPE)
+
+###################################################################################################
+# - jitify ----------------------------------------------------------------------------------------
+
+message("Fetching Jitify")
+
+FetchContent_Declare(
+    jitify
+    GIT_REPOSITORY https://github.com/rapidsai/jitify.git
+    GIT_TAG        cudf_0.15
+    GIT_SHALLOW    true
+)
+
+FetchContent_GetProperties(jitify)
+if(NOT jitify_POPULATED)
+  FetchContent_Populate(jitify)
+  # We are not using the jitify CMake targets, so no need to call `add_subdirectory()`.
+endif()
+set(JITIFY_INCLUDE_DIR "${jitify_SOURCE_DIR}" PARENT_SCOPE)
+
+###################################################################################################
+# - libcudacxx ------------------------------------------------------------------------------------
+
+message("Fetching libcudacxx")
+
+FetchContent_Declare(
+    libcudacxx
+    GIT_REPOSITORY https://github.com/rapidsai/thirdparty-freestanding.git
+    GIT_TAG        cudf
+    GIT_SHALLOW    true
+)
+
+FetchContent_GetProperties(libcudacxx)
+if(NOT libcudacxx_POPULATED)
+  FetchContent_Populate(libcudacxx)
+  # libcudacxx has no CMake targets, so no need to call `add_subdirectory()`.
+endif()
+set(LIBCUDACXX_DIR "${libcudacxx_SOURCE_DIR}" PARENT_SCOPE)
+set(LIBCUDACXX_INCLUDE_DIR "${libcudacxx_SOURCE_DIR}/include/" PARENT_SCOPE)
+set(LIBCXX_DIR "${libcudacxx_SOURCE_DIR}/libcxx/" PARENT_SCOPE)
+set(LIBCXX_INCLUDE_DIR "${libcudacxx_SOURCE_DIR}/libcxx/include/" PARENT_SCOPE)
diff --git a/thirdparty/jitify b/thirdparty/jitify
deleted file mode 160000
index e3f867027c1..00000000000
--- a/thirdparty/jitify
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit e3f867027c1d9603b5a677795900465b9fac9cb8
diff --git a/thirdparty/libcudacxx b/thirdparty/libcudacxx
deleted file mode 160000
index cdcda484d0c..00000000000
--- a/thirdparty/libcudacxx
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit cdcda484d0c7db114ea29c3b33429de5756ecfd8