Fix build failure against linux-5.2+:
  https://www.spinics.net/lists/linux-sh/msg53430.html

--- a/src/maint/atmdump.c
+++ b/src/maint/atmdump.c
@@ -17,6 +17,16 @@
 #include <netinet/in.h> /* for htonl and ntohl */
 #include <atm.h>
 
+#ifndef SIOCGSTAMP
+/* linux-5.2+ added support for 64-bit time_t into ioctls
+   that support 'struct timeval' and removed 'SIOCGSTAMP'
+   define.
+
+   Include 'SIOCGSTAMP' wrapper via linux/sockios.h
+   if does not exist.
+  */
+#    include <linux/sockios.h>
+#endif
 
 static const char *pti[] = { "Data SDU 0","Data SDU 1","Data SDU 0, CE",
   "Data SDU 1, CE","Segment OAM F5","End-to-end OAM F5","Reserved (RM)",
--- a/src/maint/saaldump.c
+++ b/src/maint/saaldump.c
@@ -24,6 +24,16 @@
 
 #define MAX_ITEM  2048 /* longest string emitted by q.dump */
 
+#ifndef SIOCGSTAMP
+/* linux-5.2+ added support for 64-bit time_t into ioctls
+   that support 'struct timeval' and removed 'SIOCGSTAMP'
+   define.
+
+   Include 'SIOCGSTAMP' wrapper via linux/sockios.h
+   if does not exist.
+  */
+#    include <linux/sockios.h>
+#endif
 
 static int interval = 0; /* display absolute time by default */
 static int quiet = 0; /* decode Q.2931 messages by default */