--- a/configure.in
+++ b/configure.in
@@ -7625,20 +7625,24 @@ AC_SUBST(NECKO_COOKIES)
 if test "$NECKO_COOKIES"; then
     AC_DEFINE(NECKO_COOKIES)
 fi
 
 dnl
 dnl Build jsctypes on the platforms we can.
 dnl
 AC_SUBST(BUILD_CTYPES)
-if test "$OS_TEST" != "arm"; then
+case "$OS_TEST" in
+arm*)
+  ;;
+*)
   BUILD_CTYPES=1
   AC_DEFINE(BUILD_CTYPES)
-fi
+  ;;
+esac
 
 dnl NECKO_ configuration options are not global
 _NON_GLOBAL_ACDEFINES="$_NON_GLOBAL_ACDEFINES NECKO_"
 
 dnl Only build Mork if it's required
 AC_SUBST(MOZ_MORK)
 if test "$MOZ_MORK"; then
   AC_DEFINE(MOZ_MORK)