Make the guardfraction.c module dirauth-only.

src/app/config/config.c

@@ -3561,10 +3561,12 @@ options_validate(or_options_t *old_options, or_options_t *options,
       dirserv_read_measured_bandwidths(options->V3BandwidthsFile, NULL, NULL,
                                        NULL);
     }
+#ifdef HAVE_MODULE_DIRAUTH
     /* same for guardfraction file */
     if (options->GuardfractionFile && !old_options) {
       dirserv_read_guardfraction_file(options->GuardfractionFile, NULL);
     }
+#endif
   }
 
   if (options->AuthoritativeDir && !options->DirPort_set)

src/core/include.am

@@ -154,7 +154,6 @@ LIBTOR_APP_A_SOURCES = 				\
 # the separation is only in the code location.
 LIBTOR_APP_A_SOURCES += 			\
 	src/feature/dirauth/bwauth.c		\
-	src/feature/dirauth/guardfraction.c	\
 	src/feature/dirauth/reachability.c	\
 	src/feature/dirauth/voteflags.c
 
@@ -178,6 +177,7 @@ MODULE_DIRAUTH_SOURCES = 					\
 	src/feature/dirauth/dircollate.c			\
 	src/feature/dirauth/dirvote.c				\
 	src/feature/dirauth/dsigs_parse.c			\
+	src/feature/dirauth/guardfraction.c			\
 	src/feature/dirauth/process_descs.c			\
 	src/feature/dirauth/recommend_pkg.c			\
 	src/feature/dirauth/shared_random.c			\