Index: auto.def
==================================================================
--- auto.def
+++ auto.def
@@ -479,10 +479,11 @@
 cc-check-function-in-lib sin m
 
 # Check for the FuseFS library
 if {[opt-bool fusefs]} {
   if {[cc-check-function-in-lib fuse_mount fuse]} {
+     define-append EXTRA_CFLAGS -DFOSSIL_HAVE_FUSEFS
      define FOSSIL_HAVE_FUSEFS 1
      define-append LIBS -lfuse
      msg-result "FuseFS support enabled"
   }
 }

Index: src/fusefs.c
==================================================================
--- src/fusefs.c
+++ src/fusefs.c
@@ -20,12 +20,12 @@
 **
 ** This module is a mostly a no-op unless compiled with -DFOSSIL_HAVE_FUSEFS.
 ** The FOSSIL_HAVE_FUSEFS should be omitted on systems that lack support for
 ** the Fuse Filesystem, of course.
 */
-#include "config.h"
 #ifdef FOSSIL_HAVE_FUSEFS
+#include "config.h"
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>