diff --git a/include/boost/math/concepts/std_real_concept.hpp b/include/boost/math/concepts/std_real_concept.hpp
index 277c35caf..f77935c7f 100644
--- a/include/boost/math/concepts/std_real_concept.hpp
+++ b/include/boost/math/concepts/std_real_concept.hpp
@@ -90,6 +90,9 @@ public:
    std_real_concept& operator=(float c) { m_value = c; return *this; }
    std_real_concept& operator=(double c) { m_value = c; return *this; }
    std_real_concept& operator=(long double c) { m_value = c; return *this; }
+#ifdef BOOST_MATH_USE_FLOAT128
+   std_real_concept& operator=(BOOST_MATH_FLOAT128_TYPE c) { m_value = c; return *this; }
+#endif
 
    // Access:
    std_real_concept_base_type value()const{ return m_value; }
diff --git a/test/exp_sinh_quadrature_test.cpp b/test/exp_sinh_quadrature_test.cpp
index 7bba2298a..deed18c92 100644
--- a/test/exp_sinh_quadrature_test.cpp
+++ b/test/exp_sinh_quadrature_test.cpp
@@ -644,7 +644,7 @@ BOOST_AUTO_TEST_CASE(exp_sinh_quadrature_test)
     test_right_limit_infinite<std::float64_t>();
     test_nr_examples<std::float64_t>();
     test_crc<std::float64_t>();
-    test_non_central_t<float64_t>();
+    test_non_central_t<std::float64_t>();
 #else
     test_left_limit_infinite<double>();
     test_right_limit_infinite<double>();
diff --git a/test/test_nc_t_quad.cpp b/test/test_nc_t_quad.cpp
index 0f0179c45..5b7ac27d3 100644
--- a/test/test_nc_t_quad.cpp
+++ b/test/test_nc_t_quad.cpp
@@ -40,6 +40,14 @@ using std::endl;
 #include <limits>
 using std::numeric_limits;
 
+#if defined(__GNUC__) && (__GNUC__ < 13) && (defined(__CYGWIN__) || defined(_WIN32))
+//
+// We either get an internal compiler error, or worse, the compiler prints nothing at all
+// and exits with an error code :(
+//
+# define DISABLE_THIS_TEST
+#endif
+
 
 void expected_results()
 {
@@ -83,10 +91,12 @@ BOOST_AUTO_TEST_CASE( test_main )
   BOOST_MATH_CONTROL_FP;
    // Basic sanity-check spot values.
    expected_results();
+#ifndef DISABLE_THIS_TEST
 #if !BOOST_WORKAROUND(BOOST_MSVC, < 1920)
    test_spots(boost::multiprecision::cpp_bin_float_quad(0));
 #endif
    test_accuracy(boost::multiprecision::cpp_bin_float_quad(0), "cpp_bin_float_quad");
+#endif
    // double precision tests only:
    //test_big_df(boost::multiprecision::cpp_bin_float_quad(0));
 } // BOOST_AUTO_TEST_CASE( test_main )