diff --git a/BUILD.bazel b/BUILD.bazel
index 8776fcb2ecf..490f33fa0a5 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -20,7 +20,6 @@ COMMON_COPTS = [
     "-DHAVE_SHM_OPEN=1",
     "-DHAVE_SHM_UNLINK=1",
     "-D_FILE_OFFSET_BITS=64",
-    "-DTH_HAVE_THREAD",
     "-DUSE_FBGEMM",
     "-DUSE_DISTRIBUTED",
     "-DAT_PER_OPERATOR_HEADERS",
@@ -268,7 +267,6 @@ header_template_rule(
         "@AT_MKLDNN_ACL_ENABLED@": "0",
         "@AT_MKL_ENABLED@": "1",
         "@AT_MKL_SEQUENTIAL@": "0",
-        "@AT_FFTW_ENABLED@": "0",
         "@AT_POCKETFFT_ENABLED@": "0",
         "@AT_NNPACK_ENABLED@": "0",
         "@CAFFE2_STATIC_LINK_CUDA_INT@": "0",
@@ -1471,7 +1469,6 @@ cu_library(
 )
 
 PERF_COPTS = [
-    "-DTH_HAVE_THREAD",
     "-DHAVE_AVX_CPU_DEFINITION",
     "-DHAVE_AVX2_CPU_DEFINITION",
     "-DENABLE_ALIAS=1",
diff --git a/aten/src/ATen/Config.h.in b/aten/src/ATen/Config.h.in
index ca2e08e6a33..93b8e0434f1 100644
--- a/aten/src/ATen/Config.h.in
+++ b/aten/src/ATen/Config.h.in
@@ -10,7 +10,6 @@
 #define AT_MKLDNN_ACL_ENABLED() @AT_MKLDNN_ACL_ENABLED@
 #define AT_MKL_ENABLED() @AT_MKL_ENABLED@
 #define AT_MKL_SEQUENTIAL() @AT_MKL_SEQUENTIAL@
-#define AT_FFTW_ENABLED() @AT_FFTW_ENABLED@
 #define AT_POCKETFFT_ENABLED() @AT_POCKETFFT_ENABLED@
 #define AT_NNPACK_ENABLED() @AT_NNPACK_ENABLED@
 #define CAFFE2_STATIC_LINK_CUDA() @CAFFE2_STATIC_LINK_CUDA_INT@
diff --git a/buckbuild.bzl b/buckbuild.bzl
index 480a505b0ae..0c90c40cd3c 100644
--- a/buckbuild.bzl
+++ b/buckbuild.bzl
@@ -1050,9 +1050,6 @@ def define_buck_targets(
             "@AT_MKL_SEQUENTIAL@",
             "ATEN_MKL_SEQUENTIAL_FBXPLAT",
             "--replace",
-            "@AT_FFTW_ENABLED@",
-            "0",
-            "--replace",
             "@AT_POCKETFFT_ENABLED@",
             "1",
             "--replace",
diff --git a/cmake/Dependencies.cmake b/cmake/Dependencies.cmake
index c3abce52e4c..2e93930c8cf 100644
--- a/cmake/Dependencies.cmake
+++ b/cmake/Dependencies.cmake
@@ -281,21 +281,6 @@ elseif(INTERN_USE_EIGEN_BLAS)
   list(APPEND Caffe2_DEPENDENCY_LIBS eigen_blas)
 endif()
 
-# ---[ FFTW
-set(AT_FFTW_ENABLED 0)
-set(USE_FFTW OFF)
-if(USE_FFTW OR NOT MKL_FOUND)
-  find_library(LIBFFTW3 fftw3)
-  if(LIBFFTW3)
-    find_path(FFTW3_INCLUDE_DIR NAMES fftw3.h ONLY_CMAKE_FIND_ROOT_PATH)
-    if(FFTW3_INCLUDE_DIR)
-      SET(AT_FFTW_ENABLED 1)
-      SET(USE_FFTW ON)
-      include_directories(${FFTW3_INCLUDE_DIR})
-    endif()
-  endif()
-endif()
-
 # --- [ PocketFFT
 set(AT_POCKETFFT_ENABLED 0)
 if(NOT AT_MKL_ENABLED)
@@ -1814,18 +1799,6 @@ if(NOT INTERN_BUILD_MOBILE)
   add_definitions(-DUSE_EXTERNAL_MZCRC)
   add_definitions(-DMINIZ_DISABLE_ZIP_READER_CRC32_CHECKS)
 
-  # Is __thread supported?
-  if(NOT MSVC)
-    CHECK_C_SOURCE_COMPILES("static __thread int x = 1; int main() { return x; }" C_HAS_THREAD)
-  else(NOT MSVC)
-    CHECK_C_SOURCE_COMPILES("static __declspec( thread ) int x = 1; int main() { return x; }" C_HAS_THREAD)
-  endif(NOT MSVC)
-  if(NOT C_HAS_THREAD)
-    message(STATUS "Warning: __thread is not supported, generating thread-unsafe code")
-  else(NOT C_HAS_THREAD)
-    add_compile_options(-DTH_HAVE_THREAD)
-  endif(NOT C_HAS_THREAD)
-
   find_package(ZVECTOR) # s390x simd support
 endif()
 
diff --git a/cmake/Summary.cmake b/cmake/Summary.cmake
index 293f9ff5d6d..ae69c919af7 100644
--- a/cmake/Summary.cmake
+++ b/cmake/Summary.cmake
@@ -141,7 +141,6 @@ function(caffe2_print_configuration_summary)
   message(STATUS "  USE_PYTORCH_METAL     : ${USE_PYTORCH_METAL}")
   message(STATUS "  USE_PYTORCH_METAL_EXPORT     : ${USE_PYTORCH_METAL_EXPORT}")
   message(STATUS "  USE_MPS               : ${USE_MPS}")
-  message(STATUS "  USE_FFTW              : ${USE_FFTW}")
   message(STATUS "  USE_MKL               : ${CAFFE2_USE_MKL}")
   message(STATUS "  USE_MKLDNN            : ${USE_MKLDNN}")
   if(${USE_MKLDNN})
diff --git a/defs.bzl b/defs.bzl
index 4f912dd1d4e..6c32f5f9c8b 100644
--- a/defs.bzl
+++ b/defs.bzl
@@ -29,7 +29,6 @@ default_compiler_flags = [
     "-DHAVE_SHM_OPEN=1",
     "-DHAVE_SHM_UNLINK=1",
     "-DHAVE_MALLOC_USABLE_SIZE=1",
-    "-DTH_HAVE_THREAD",
     "-DCPU_CAPABILITY_DEFAULT",
     "-DTH_INDEX_BASE=0",
     "-DMAGMA_V2",