diff -ruwN source/pcretest.c source-new/pcretest.c
--- source/pcretest.c	2017-06-13 10:49:46.000000000 -0600
+++ source-new/pcretest.c	2019-01-05 11:04:15.198224299 -0700
@@ -3168,7 +3168,7 @@
       ((stack_size = get_value((pcre_uint8 *)argv[op+1], &endptr)),
         *endptr == 0))
     {
-#if defined(_WIN32) || defined(WIN32) || defined(__minix) || defined(NATIVE_ZOS) || defined(__VMS)
+#if defined(_WIN32) || defined(WIN32) || defined(__minix) || defined(NATIVE_ZOS) || defined(__VMS) || defined(__redox__)
     printf("PCRE: -S not supported on this OS\n");
     exit(1);
 #else
@@ -5770,4 +5770,3 @@
 }
 
 /* End of pcretest.c */
-