diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0f0e00a87..230b8b0ca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -334,7 +334,7 @@ jobs:
           run: cp -r $GITHUB_WORKSPACE/* libs/math
           working-directory: ../boost-root
         - name: Run CMake
-          run: cmake -DBUILD_TESTING=1 .
+          run: cmake -DBUILD_TESTING=1 -DCMAKE_CXX_COMPILER=g++-10 .
           working-directory: ../boost-root/libs/math
         - name: Run Compile Tests
           run: make -j$((`nproc`+1))
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 000000000..36b7cd93c
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,23 @@
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/include/boost/math/special_functions/detail/fp_traits.hpp b/include/boost/math/special_functions/detail/fp_traits.hpp
index de58d55b0..cb384bec7 100644
--- a/include/boost/math/special_functions/detail/fp_traits.hpp
+++ b/include/boost/math/special_functions/detail/fp_traits.hpp
@@ -33,11 +33,13 @@ With these techniques, the code could be simplified.
 #define BOOST_MATH_ENDIAN_BIG_BYTE BOOST_ENDIAN_BIG_BYTE
 #define BOOST_MATH_ENDIAN_LITTLE_BYTE BOOST_ENDIAN_LITTLE_BYTE
 
-#elif (__cplusplus > 202000L || _MSVC_LANG > 202000L) && __has_include(<bit>)
+#elif (__cplusplus > 202000L || _MSVC_LANG > 202000L)
 
+#if __has_include(<bit>)
 #include <bit>
 #define BOOST_MATH_ENDIAN_BIG_BYTE (std::endian::native == std::endian::big)
 #define BOOST_MATH_ENDIAN_LITTLE_BYTE (std::endian::native == std::endian::little)
+#endif
 
 #elif defined(_WIN32)
 
diff --git a/include/boost/math/statistics/bivariate_statistics.hpp b/include/boost/math/statistics/bivariate_statistics.hpp
index 2d0e00762..b0bd9d83c 100644
--- a/include/boost/math/statistics/bivariate_statistics.hpp
+++ b/include/boost/math/statistics/bivariate_statistics.hpp
@@ -18,6 +18,7 @@
 #include <cmath>
 #include <cstddef>
 #include <boost/math/tools/assert.hpp>
+#include <boost/math/tools/config.hpp>
 
 // Support compilers with P0024R2 implemented without linking TBB
 // https://en.cppreference.com/w/cpp/compiler_support
diff --git a/include/boost/math/tools/config.hpp b/include/boost/math/tools/config.hpp
index 2c32c8385..70b741258 100644
--- a/include/boost/math/tools/config.hpp
+++ b/include/boost/math/tools/config.hpp
@@ -31,9 +31,13 @@
 
 #if (__cplusplus > 201700L || _MSVC_LANG > 201700L)
 #define BOOST_IF_CONSTEXPR if constexpr
+#if !__has_include(<execution>)
+#define BOOST_NO_CXX17_HDR_EXECUTION
+#endif
 #else
 #define BOOST_IF_CONSTEXPR if
 #define BOOST_NO_CXX17_IF_CONSTEXPR
+#define BOOST_NO_CXX17_HDR_EXECUTION
 #endif
 
 #define BOOST_JOIN(X, Y) BOOST_DO_JOIN(X, Y)