diff --git a/acinclude.m4 b/acinclude.m4
index f0868de4da..08486d3e61 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -208,53 +208,6 @@ AC_DEFUN([WX_CPP_NEW_HEADERS],
     AC_LANG_RESTORE
 ])
 
-dnl ---------------------------------------------------------------------------
-dnl WX_CPP_EXPLICIT checks whether the C++ compiler support the explicit
-dnl keyword and defines HAVE_EXPLICIT if this is the case
-dnl ---------------------------------------------------------------------------
-
-AC_DEFUN([WX_CPP_EXPLICIT],
-[
-  AC_CACHE_CHECK([if C++ compiler supports the explicit keyword],
-                 wx_cv_explicit,
-  [
-    AC_LANG_SAVE
-    AC_LANG_CPLUSPLUS
-
-    dnl do the test in 2 steps: first check that the compiler knows about the
-    dnl explicit keyword at all and then verify that it really honours it
-    AC_TRY_COMPILE(
-      [
-        class Foo { public: explicit Foo(int) {} };
-      ],
-      [
-        return 0;
-      ],
-      [
-        AC_TRY_COMPILE(
-            [
-                class Foo { public: explicit Foo(int) {} };
-                static void TakeFoo(const Foo& foo) { }
-            ],
-            [
-                TakeFoo(17);
-                return 0;
-            ],
-            wx_cv_explicit=no,
-            wx_cv_explicit=yes
-        )
-      ],
-      wx_cv_explicit=no
-    )
-
-    AC_LANG_RESTORE
-  ])
-
-  if test "$wx_cv_explicit" = "yes"; then
-    AC_DEFINE(HAVE_EXPLICIT)
-  fi
-])
-
 dnl ---------------------------------------------------------------------------
 dnl WX_CHECK_FUNCS(FUNCTIONS...,
 dnl                [ACTION-IF-FOUND],
diff --git a/configure b/configure
index fb8476aeae..81c9025278 100755
--- a/configure
+++ b/configure
@@ -18988,86 +18988,6 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
-
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking if C++ compiler supports the explicit keyword" >&5
-$as_echo_n "checking if C++ compiler supports the explicit keyword... " >&6; }
-if ${wx_cv_explicit+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-
-
-    ac_ext=cpp
-ac_cpp='$CXXCPP $CPPFLAGS'
-ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
-
-
-            cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-        class Foo { public: explicit Foo(int) {} };
-
-int
-main ()
-{
-
-        return 0;
-
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_cxx_try_compile "$LINENO"; then :
-
-        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-                class Foo { public: explicit Foo(int) {} };
-                static void TakeFoo(const Foo& foo) { }
-
-int
-main ()
-{
-
-                TakeFoo(17);
-                return 0;
-
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_cxx_try_compile "$LINENO"; then :
-  wx_cv_explicit=no
-else
-  wx_cv_explicit=yes
-
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-
-else
-  wx_cv_explicit=no
-
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-
-    ac_ext=c
-ac_cpp='$CPP $CPPFLAGS'
-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_c_compiler_gnu
-
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $wx_cv_explicit" >&5
-$as_echo "$wx_cv_explicit" >&6; }
-
-  if test "$wx_cv_explicit" = "yes"; then
-    $as_echo "#define HAVE_EXPLICIT 1" >>confdefs.h
-
-  fi
-
-
 ac_ext=cpp
 ac_cpp='$CXXCPP $CPPFLAGS'
 ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
diff --git a/configure.in b/configure.in
index 15b95395ee..317a0de223 100644
--- a/configure.in
+++ b/configure.in
@@ -1802,9 +1802,6 @@ if test "$HAVE_CXX11" != "1" ; then
 dnl check for iostream (as opposed to iostream.h) standard header
 WX_CPP_NEW_HEADERS(, AC_DEFINE(wxUSE_IOSTREAMH))
 
-dnl check whether C++ compiler supports explicit keyword
-WX_CPP_EXPLICIT
-
 dnl the next few tests are all for C++ features and so need to be done using
 dnl C++ compiler
 AC_LANG_PUSH(C++)
diff --git a/include/wx/defs.h b/include/wx/defs.h
index 93db4d7c0e..eece8810a2 100644
--- a/include/wx/defs.h
+++ b/include/wx/defs.h
@@ -258,7 +258,7 @@ typedef short int WXTYPE;
     #define wxOVERRIDE override
 #else /*  !HAVE_OVERRIDE */
     #define wxOVERRIDE
-#endif /*  HAVE_OVERRIDE/!HAVE_EXPLICIT */
+#endif /*  HAVE_OVERRIDE */
 
 /* wxFALLTHROUGH is used to notate explicit fallthroughs in switch statements */
 
diff --git a/include/wx/osx/config_xcode.h b/include/wx/osx/config_xcode.h
index ca0619bc78..0146ec98b1 100644
--- a/include/wx/osx/config_xcode.h
+++ b/include/wx/osx/config_xcode.h
@@ -21,7 +21,6 @@
 #define __DARWIN__ 1
 #define wx_USE_NANOX 0
 
-#define HAVE_EXPLICIT 1
 #define HAVE_VA_COPY 1
 #define HAVE_VARIADIC_MACROS 1
 #define HAVE_STD_WSTRING 1
diff --git a/setup.h.in b/setup.h.in
index 06c9fc942d..23807726dc 100644
--- a/setup.h.in
+++ b/setup.h.in
@@ -712,11 +712,6 @@
 #define wxUSE_CRASHREPORT 0
 /* --- end MSW options --- */
 
-/*
- * Define if your compiler supports the explicit keyword
- */
-#undef HAVE_EXPLICIT
-
 /*
  * Define if your compiler has C99 va_copy
  */
diff --git a/setup.h_vms b/setup.h_vms
index f93c131e1c..08624f8647 100644
--- a/setup.h_vms
+++ b/setup.h_vms
@@ -781,11 +781,6 @@ typedef pid_t GPid;
 
 /* --- end MSW options --- */
 
-/*
- * Define if your compiler supports the explicit keyword
- */
-#define HAVE_EXPLICIT 1
-
 /*
  * Define if your compiler has C99 va_copy
  */