diff --git a/lib/command_lex.l b/lib/command_lex.l
index 436f3a241d..530900659b 100644
--- a/lib/command_lex.l
+++ b/lib/command_lex.l
@@ -23,8 +23,9 @@
  */
 
 %{
-/* ignore harmless bug in old versions of flex */
+/* ignore harmless bugs in old versions of flex */
 #pragma GCC diagnostic ignored "-Wsign-compare"
+#pragma GCC diagnostic ignored "-Wmissing-prototypes"
 
 #include "command_parse.h"
 
diff --git a/lib/defun_lex.l b/lib/defun_lex.l
index 024445be63..87775a0e75 100644
--- a/lib/defun_lex.l
+++ b/lib/defun_lex.l
@@ -34,8 +34,9 @@
  * code documentation in it.
  */
 
-/* ignore harmless bug in old versions of flex */
+/* ignore harmless bugs in old versions of flex */
 #pragma GCC diagnostic ignored "-Wsign-compare"
+#pragma GCC diagnostic ignored "-Wunused-value"
 
 #include "config.h"
 #include <Python.h>
diff --git a/lib/prefix.h b/lib/prefix.h
index 7e947ea48a..bcc2230607 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -39,12 +39,6 @@
 #define ETH_ALEN 6
 #endif
 
-/* for compatibility */
-#ifdef ETHER_ADDR_LEN
-#undef ETHER_ADDR_LEN
-#endif
-#define ETHER_ADDR_LEN 6 CPP_WARN("ETHER_ADDR_LEN is being replaced by ETH_ALEN.\\n")
-
 #define ETHER_ADDR_STRLEN (3*ETH_ALEN)
 /*
  * there isn't a portable ethernet address type. We define our
diff --git a/lib/spf_backoff.c b/lib/spf_backoff.c
index 92b7620eda..d7907fafdf 100644
--- a/lib/spf_backoff.c
+++ b/lib/spf_backoff.c
@@ -205,7 +205,7 @@ static const char *timeval_format(struct timeval *tv)
 
 	size_t offset = strlen(timebuf);
 	snprintf(timebuf + offset, sizeof(timebuf) - offset, ".%ld",
-		 tv->tv_usec);
+		 (long int)tv->tv_usec);
 
 	return timebuf;
 }
diff --git a/zebra/kernel_socket.c b/zebra/kernel_socket.c
index ba028ed09c..2a3b95058e 100644
--- a/zebra/kernel_socket.c
+++ b/zebra/kernel_socket.c
@@ -40,6 +40,7 @@
 #include "privs.h"
 #include "vrf.h"
 
+#include "zebra/rt.h"
 #include "zebra/interface.h"
 #include "zebra/zserv.h"
 #include "zebra/debug.h"