diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6531bab5..cec744ea 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,15 +53,15 @@ include(CheckCXXSourceCompiles)
 include(CheckCXXCompilerFlag)
 
 ## Check for buggy constexpr support G++ 5.0
-check_cxx_source_compiles(
-  "
-  using T = int;
-  constexpr int exec(T f()) { return f(); }
-  constexpr int foo() { return 1; }
-  static_assert(exec(foo) == 1, \"Failed exec\");
-  int main() {}
-  "
-  HPCOMBI_CONSTEXPR_FUN_ARGS)
+# check_cxx_source_compiles(
+#   "
+#   using T = int;
+#   constexpr int exec(T f()) { return f(); }
+#   constexpr int foo() { return 1; }
+#   static_assert(exec(foo) == 1, \"Failed exec\");
+#   int main() {}
+#   "
+#   HPCOMBI_CONSTEXPR_FUN_ARGS)
 
 check_cxx_compiler_flag('-march=native' HPCOMBI_HAVE_FLAG_ARCH_NATIVE)
 check_cxx_compiler_flag('-mtune=native' HPCOMBI_HAVE_FLAG_TUNE_NATIVE)
diff --git a/config.h.in b/config.h.in
index f84cbbfa..7a1f2ccc 100644
--- a/config.h.in
+++ b/config.h.in
@@ -8,19 +8,10 @@
 #ifndef HPCOMBI_CONFIG_HPP
 #define HPCOMBI_CONFIG_HPP
 
-// Whether the compiler provide the "experimental/numeric" include file
-#cmakedefine HPCOMBI_HAVE_EXPERIMENTAL_NUMERIC
-
-// Whether std::experimental::lcm function works
-#cmakedefine HPCOMBI_HAVE_EXPERIMENTAL_NUMERIC_LCM
-
 // Google sparse hash map
 #cmakedefine HPCOMBI_HAVE_DENSEHASHMAP
 
 // Google sparse hash set
 #cmakedefine HPCOMBI_HAVE_DENSEHASHSET
 
-// GCC-4.8 constexpr function argument bug
-#cmakedefine HPCOMBI_CONSTEXPR_FUN_ARGS
-
 #endif  // HPCOMBI_CONFIG_HPP