diff --git a/src/auth/mech-gssapi.c b/src/auth/mech-gssapi.c
index 57a2b12..ed7ff22 100644
--- a/src/auth/mech-gssapi.c
+++ b/src/auth/mech-gssapi.c
@@ -24,6 +24,8 @@
 
 #if defined(BUILTIN_GSSAPI) || defined(PLUGIN_BUILD)
 
+#include <krb5.h>
+
 #ifdef HAVE_GSSAPI_GSSAPI_H
 #  include <gssapi/gssapi.h>
 #elif defined (HAVE_GSSAPI_H)
diff --git a/src/lib/cpu-count.c b/src/lib/cpu-count.c
index 3eb38fa..5464bc0 100644
--- a/src/lib/cpu-count.c
+++ b/src/lib/cpu-count.c
@@ -2,7 +2,7 @@
 #include "cpu-count.h"
 
 #ifdef HAVE_SCHED_H
-#  define __USE_GNU
+#  define _GNU_SOURCE
 #  include <sched.h>
 #  ifdef HAVE_SYS_CPUSET_H
 #    include <sys/cpuset.h>