@@ -951,10 +951,11 @@
 	AC_MSG_CHECKING(for threads)
 
 	case "$host_os" in
 	amigaos* | morphos*)
 		AC_MSG_RESULT(Amiga)
+		have_amiga_threads="yes"
 		;;
 	mingw*)
 		AC_MSG_RESULT(WinAPI)
 		;;
 	*)
@@ -1800,11 +1801,11 @@
 	echo "features)."
 	echo
 ])
 
 AS_IF([test x"$enable_threads" != x"no" -a x"$atomic_ops" = x"none" \
-    -a x"$have_spinlocks" != x"yes"], [
+    -a x"$have_spinlocks" != x"yes" -a x"$have_amiga_threads" != x"yes"], [
 	echo
 	printf "  ** Warning: You have enabled threads, but neither atomic "
 	echo "operations nor"
 	printf "  ** spinlocks are available. Expect *very* poor performance, "
 	echo "as a mutex will"