--- nono/configure	2026/04/29 17:05:51	1.1.1.19
+++ nono/configure	2026/04/29 17:05:56	1.1.1.20
@@ -4894,6 +4894,42 @@ rm -f core conftest.err conftest.$ac_obj
 	CXXFLAGS="${old_CXXFLAGS}"
 
 
+	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether c++ accepts -Wimplicit-fallthrough" >&5
+printf %s "checking whether c++ accepts -Wimplicit-fallthrough... " >&6; }
+	old_CXXFLAGS="${CXXFLAGS}"
+	CXXFLAGS="${CXXFLAGS} -Werror -Wimplicit-fallthrough"
+	cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"
+then :
+
+		{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+printf "%s\n" "yes" >&6; }
+		eval `echo cxx_has-Wimplicit-fallthrough=yes | sed -e 's/-/_/g'`
+		WARNFLAGS_CXX="${WARNFLAGS_CXX} -Wimplicit-fallthrough"
+
+else case e in #(
+  e)
+		{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+	 ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+	CXXFLAGS="${old_CXXFLAGS}"
+
+
 	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether c++ accepts -Winconsistent-missing-destructor-override" >&5
 printf %s "checking whether c++ accepts -Winconsistent-missing-destructor-override... " >&6; }
 	old_CXXFLAGS="${CXXFLAGS}"
@@ -6778,6 +6814,49 @@ printf "%s\n" "yes" >&6; }
 
 
 else case e in #(
+  e)
+		{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+	 ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for HTOBE16" >&5
+printf %s "checking for HTOBE16... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+		#if defined(HAVE_ENDIAN_H)
+		#include <endian.h>
+		#endif
+		#if defined(HAVE_SYS_ENDIAN_H)
+		#include <sys/endian.h>
+		#endif
+		#if defined(HAVE_MACHINE_ENDIAN_H)
+		#include <machine/endian.h>
+		#endif
+
+int
+main (void)
+{
+
+		uint16_t x = 0;
+		HTOBE16(x);
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"
+then :
+
+		{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+printf "%s\n" "yes" >&6; }
+		printf "%s\n" "#define HAVE_INPLACE_HTOBE16 1" >>confdefs.h
+
+
+else case e in #(
   e)
 		{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
 printf "%s\n" "no" >&6; }