diff --git a/thrust/cmake/ThrustHeaderTesting.cmake b/thrust/cmake/ThrustHeaderTesting.cmake
index 9a39c93e26a..2eb3e33b5d6 100644
--- a/thrust/cmake/ThrustHeaderTesting.cmake
+++ b/thrust/cmake/ThrustHeaderTesting.cmake
@@ -125,7 +125,6 @@ function(thrust_add_header_test thrust_target label definitions)
     ${header_definitions}
     "THRUST_CPP11_REQUIRED_NO_ERROR"
     "THRUST_CPP14_REQUIRED_NO_ERROR"
-    "THRUST_MODERN_GCC_REQUIRED_NO_ERROR"
   )
   thrust_clone_target_properties(${headertest_target} ${thrust_target})
 
diff --git a/thrust/examples/arbitrary_transformation.cu b/thrust/examples/arbitrary_transformation.cu
index ead08af9bb9..369794c6192 100644
--- a/thrust/examples/arbitrary_transformation.cu
+++ b/thrust/examples/arbitrary_transformation.cu
@@ -3,13 +3,10 @@
 #include <thrust/device_vector.h>
 #include <thrust/for_each.h>
 #include <thrust/iterator/zip_iterator.h>
+#include <thrust/zip_function.h>
 
 #include <iostream>
 
-#if !defined(THRUST_LEGACY_GCC)
-#  include <thrust/zip_function.h>
-#endif // >= C++11
-
 #include "include/host_device.h"
 
 // This example shows how to implement an arbitrary transformation of
@@ -54,7 +51,6 @@ struct arbitrary_functor1
   }
 };
 
-#if !defined(THRUST_LEGACY_GCC)
 struct arbitrary_functor2
 {
   __host__ __device__ void operator()(const float& a, const float& b, const float& c, float& d)
@@ -63,7 +59,6 @@ struct arbitrary_functor2
     d = a + b * c;
   }
 };
-#endif // >= C++11
 
 int main()
 {
@@ -95,7 +90,6 @@ int main()
   }
 
   // apply the transformation using zip_function
-#if !defined(THRUST_LEGACY_GCC)
   thrust::device_vector<float> D2(5);
   thrust::for_each(thrust::make_zip_iterator(thrust::make_tuple(A.begin(), B.begin(), C.begin(), D2.begin())),
                    thrust::make_zip_iterator(thrust::make_tuple(A.end(), B.end(), C.end(), D2.end())),
@@ -107,5 +101,4 @@ int main()
   {
     std::cout << A[i] << " + " << B[i] << " * " << C[i] << " = " << D2[i] << std::endl;
   }
-#endif // >= C++11
 }
diff --git a/thrust/testing/zip_function.cu b/thrust/testing/zip_function.cu
index 2a7117a05b1..279960592b5 100644
--- a/thrust/testing/zip_function.cu
+++ b/thrust/testing/zip_function.cu
@@ -1,17 +1,15 @@
 #include <thrust/detail/config.h>
 
-#if !defined(THRUST_LEGACY_GCC)
+#include <thrust/device_vector.h>
+#include <thrust/iterator/zip_iterator.h>
+#include <thrust/remove.h>
+#include <thrust/sort.h>
+#include <thrust/transform.h>
+#include <thrust/zip_function.h>
 
-#  include <thrust/device_vector.h>
-#  include <thrust/iterator/zip_iterator.h>
-#  include <thrust/remove.h>
-#  include <thrust/sort.h>
-#  include <thrust/transform.h>
-#  include <thrust/zip_function.h>
+#include <iostream>
 
-#  include <iostream>
-
-#  include <unittest/unittest.h>
+#include <unittest/unittest.h>
 
 using namespace unittest;
 
@@ -35,9 +33,9 @@ struct TestZipFunctionCtor
   {
     ASSERT_EQUAL(thrust::zip_function<SumThree>()(thrust::make_tuple(1, 2, 3)), SumThree{}(1, 2, 3));
     ASSERT_EQUAL(thrust::zip_function<SumThree>(SumThree{})(thrust::make_tuple(1, 2, 3)), SumThree{}(1, 2, 3));
-#  ifdef __cpp_deduction_guides
+#ifdef __cpp_deduction_guides
     ASSERT_EQUAL(thrust::zip_function(SumThree{})(thrust::make_tuple(1, 2, 3)), SumThree{}(1, 2, 3));
-#  endif // __cpp_deduction_guides
+#endif // __cpp_deduction_guides
   }
 };
 SimpleUnitTest<TestZipFunctionCtor, type_list<int>> TestZipFunctionCtorInstance;
@@ -176,4 +174,3 @@ struct TestNestedZipFunction2
   }
 };
 SimpleUnitTest<TestNestedZipFunction2, type_list<int, float>> TestNestedZipFunctionInstance2;
-#endif // _CCCL_STD_VER
diff --git a/thrust/thrust/detail/config/compiler.h b/thrust/thrust/detail/config/compiler.h
index 06a5f950712..0a74cf3baea 100644
--- a/thrust/thrust/detail/config/compiler.h
+++ b/thrust/thrust/detail/config/compiler.h
@@ -30,84 +30,6 @@
 #  pragma system_header
 #endif // no system header
 
-// enumerate host compilers we know about
-//! deprecated [Since 2.7]
-#define THRUST_HOST_COMPILER_UNKNOWN 0
-//! deprecated [Since 2.7]
-#define THRUST_HOST_COMPILER_MSVC 1
-//! deprecated [Since 2.7]
-#define THRUST_HOST_COMPILER_GCC 2
-//! deprecated [Since 2.7]
-#define THRUST_HOST_COMPILER_CLANG 3
-//! deprecated [Since 2.7]
-#define THRUST_HOST_COMPILER_INTEL 4
-
-// enumerate device compilers we know about
-//! deprecated [Since 2.7]
-#define THRUST_DEVICE_COMPILER_UNKNOWN 0
-//! deprecated [Since 2.7]
-#define THRUST_DEVICE_COMPILER_MSVC 1
-//! deprecated [Since 2.7]
-#define THRUST_DEVICE_COMPILER_GCC 2
-//! deprecated [Since 2.7]
-#define THRUST_DEVICE_COMPILER_CLANG 3
-//! deprecated [Since 2.7]
-#define THRUST_DEVICE_COMPILER_NVCC 4
-
-// figure out which host compiler we're using
-#if _CCCL_COMPILER(MSVC)
-//! deprecated [Since 2.7]
-#  define THRUST_HOST_COMPILER THRUST_HOST_COMPILER_MSVC
-//! deprecated [Since 2.7]
-#  define THRUST_MSVC_VERSION _MSC_VER
-//! deprecated [Since 2.7]
-#  define THRUST_MSVC_VERSION_FULL _MSC_FULL_VER
-#elif _CCCL_COMPILER(CLANG)
-//! deprecated [Since 2.7]
-#  define THRUST_HOST_COMPILER THRUST_HOST_COMPILER_CLANG
-//! deprecated [Since 2.7]
-#  define THRUST_CLANG_VERSION (__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__)
-#elif _CCCL_COMPILER(GCC)
-//! deprecated [Since 2.7]
-#  define THRUST_HOST_COMPILER THRUST_HOST_COMPILER_GCC
-//! deprecated [Since 2.7]
-#  define THRUST_GCC_VERSION   (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
-#  if _CCCL_COMPILER(GCC, >=, 5)
-//! deprecated [Since 2.7]
-#    define THRUST_MODERN_GCC
-#  else
-//! deprecated [Since 2.7]
-#    define THRUST_LEGACY_GCC
-#  endif
-#else
-//! deprecated [Since 2.7]
-#  define THRUST_HOST_COMPILER THRUST_HOST_COMPILER_UNKNOWN
-#endif // TRUST_HOST_COMPILER
-
-// figure out which device compiler we're using
-#if defined(__CUDACC__) || defined(_NVHPC_CUDA)
-//! deprecated [Since 2.7]
-#  define THRUST_DEVICE_COMPILER THRUST_DEVICE_COMPILER_NVCC
-#elif _CCCL_COMPILER(MSVC)
-//! deprecated [Since 2.7]
-#  define THRUST_DEVICE_COMPILER THRUST_DEVICE_COMPILER_MSVC
-#elif _CCCL_COMPILER(GCC)
-//! deprecated [Since 2.7]
-#  define THRUST_DEVICE_COMPILER THRUST_DEVICE_COMPILER_GCC
-#elif _CCCL_COMPILER(CLANG)
-// CUDA-capable clang should behave similar to NVCC.
-#  if defined(__CUDA__)
-//! deprecated [Since 2.7]
-#    define THRUST_DEVICE_COMPILER THRUST_DEVICE_COMPILER_NVCC
-#  else
-//! deprecated [Since 2.7]
-#    define THRUST_DEVICE_COMPILER THRUST_DEVICE_COMPILER_CLANG
-#  endif
-#else
-//! deprecated [Since 2.7]
-#  define THRUST_DEVICE_COMPILER THRUST_DEVICE_COMPILER_UNKNOWN
-#endif
-
 // is the device compiler capable of compiling omp?
 #if defined(_OPENMP) || defined(_NVHPC_STDPAR_OPENMP)
 #  define THRUST_DEVICE_COMPILER_IS_OMP_CAPABLE THRUST_TRUE
diff --git a/thrust/thrust/detail/modern_gcc_required.h b/thrust/thrust/detail/modern_gcc_required.h
deleted file mode 100644
index b639d1d933a..00000000000
--- a/thrust/thrust/detail/modern_gcc_required.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- *  Copyright 2018 NVIDIA Corporation
- *
- *  Licensed under the Apache License, Version 2.0 (the "License");
- *  you may not use this file except in compliance with the License.
- *  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- *  Unless required by applicable law or agreed to in writing, software
- *  distributed under the License is distributed on an "AS IS" BASIS,
- *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  See the License for the specific language governing permissions and
- *  limitations under the License.
- */
-
-#pragma once
-
-#include <thrust/detail/config/cpp_dialect.h>
-
-#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
-#  pragma GCC system_header
-#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
-#  pragma clang system_header
-#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
-#  pragma system_header
-#endif // no system header
-
-#ifndef THRUST_MODERN_GCC_REQUIRED_NO_ERROR
-#  if _CCCL_COMPILER(GCC) && !defined(THRUST_MODERN_GCC)
-#    error GCC 5 or later is required for this Thrust feature; please upgrade your compiler.
-#  endif
-#endif
diff --git a/thrust/thrust/zip_function.h b/thrust/thrust/zip_function.h
index 24c52cc34eb..e9bd1bf9848 100644
--- a/thrust/thrust/zip_function.h
+++ b/thrust/thrust/zip_function.h
@@ -16,14 +16,12 @@
 #elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
 #  pragma system_header
 #endif // no system header
-#include <thrust/detail/modern_gcc_required.h>
-#if !defined(THRUST_LEGACY_GCC)
 
-#  include <thrust/detail/type_deduction.h>
-#  include <thrust/tuple.h>
-#  include <thrust/type_traits/integer_sequence.h>
+#include <thrust/detail/type_deduction.h>
+#include <thrust/tuple.h>
+#include <thrust/type_traits/integer_sequence.h>
 
-#  include <cuda/functional>
+#include <cuda/functional>
 
 THRUST_NAMESPACE_BEGIN
 
@@ -42,7 +40,7 @@ namespace zip_detail
 {
 
 // Add workaround for decltype(auto) on C++11-only compilers:
-#  if _CCCL_STD_VER >= 2014
+#if _CCCL_STD_VER >= 2014
 
 _CCCL_EXEC_CHECK_DISABLE
 template <typename Function, typename Tuple, std::size_t... Is>
@@ -58,7 +56,7 @@ _CCCL_HOST_DEVICE decltype(auto) apply(Function&& func, Tuple&& args)
   return apply_impl(THRUST_FWD(func), THRUST_FWD(args), make_index_sequence<tuple_size>{});
 }
 
-#  else // _CCCL_STD_VER
+#else // _CCCL_STD_VER
 
 _CCCL_EXEC_CHECK_DISABLE
 template <typename Function, typename Tuple, std::size_t... Is>
@@ -71,7 +69,7 @@ _CCCL_HOST_DEVICE auto apply_impl(Function&& func, Tuple&& args, index_sequence<
       THRUST_FWD(args),
       make_index_sequence<thrust::tuple_size<typename std::decay<Tuple>::type>::value>{}))
 
-#  endif // _CCCL_STD_VER
+#endif // _CCCL_STD_VER
 
 } // namespace zip_detail
 } // namespace detail
@@ -149,7 +147,7 @@ class zip_function
   {}
 
 // Add workaround for decltype(auto) on C++11-only compilers:
-#  if _CCCL_STD_VER >= 2014
+#if _CCCL_STD_VER >= 2014
 
   template <typename Tuple>
   _CCCL_HOST_DEVICE decltype(auto) operator()(Tuple&& args) const
@@ -157,7 +155,7 @@ class zip_function
     return detail::zip_detail::apply(func, THRUST_FWD(args));
   }
 
-#  else // _CCCL_STD_VER
+#else // _CCCL_STD_VER
 
   // Can't just use THRUST_DECLTYPE_RETURNS here since we need to use
   // std::declval for the signature components:
@@ -169,7 +167,7 @@ class zip_function
     return detail::zip_detail::apply(func, THRUST_FWD(args));
   }
 
-#  endif // _CCCL_STD_VER
+#endif // _CCCL_STD_VER
 
   //! Returns a reference to the underlying function.
   _CCCL_HOST_DEVICE Function& underlying_function() const
@@ -208,5 +206,3 @@ template <typename F>
 struct proclaims_copyable_arguments<THRUST_NS_QUALIFIER::zip_function<F>> : proclaims_copyable_arguments<F>
 {};
 _LIBCUDACXX_END_NAMESPACE_CUDA
-
-#endif