diff --git a/usr.sbin/ppp/arp.c b/usr.sbin/ppp/arp.c
index 9f370273b6a..fbf38d01553 100644
--- a/usr.sbin/ppp/arp.c
+++ b/usr.sbin/ppp/arp.c
@@ -38,6 +38,9 @@
 #include <sys/un.h>
 
 #include <errno.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/bundle.c b/usr.sbin/ppp/bundle.c
index 072b5c38461..4992d4ce925 100644
--- a/usr.sbin/ppp/bundle.c
+++ b/usr.sbin/ppp/bundle.c
@@ -40,6 +40,9 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <paths.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/chat.c b/usr.sbin/ppp/chat.c
index 86fd40b375d..d5f50b1814d 100644
--- a/usr.sbin/ppp/chat.c
+++ b/usr.sbin/ppp/chat.c
@@ -35,6 +35,9 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <paths.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/command.c b/usr.sbin/ppp/command.c
index 45e0bcc5a44..276ecd8561f 100644
--- a/usr.sbin/ppp/command.c
+++ b/usr.sbin/ppp/command.c
@@ -34,6 +34,9 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <paths.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/defs.c b/usr.sbin/ppp/defs.c
index 740fc628d46..257b9ce5de0 100644
--- a/usr.sbin/ppp/defs.c
+++ b/usr.sbin/ppp/defs.c
@@ -35,6 +35,9 @@
 
 #include <ctype.h>
 #include <errno.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdlib.h>
 #include <string.h>
 #include <termios.h>
diff --git a/usr.sbin/ppp/exec.c b/usr.sbin/ppp/exec.c
index de9e6324d51..b7e6607f1bd 100644
--- a/usr.sbin/ppp/exec.c
+++ b/usr.sbin/ppp/exec.c
@@ -32,6 +32,9 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/i4b.c b/usr.sbin/ppp/i4b.c
index 5e76c4fa1b4..14d34bb3e6b 100644
--- a/usr.sbin/ppp/i4b.c
+++ b/usr.sbin/ppp/i4b.c
@@ -42,6 +42,9 @@
 #include <i4b/i4b_ioctl.h>
 #include <i4b/i4b_rbch_ioctl.h>
 #endif
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/iface.c b/usr.sbin/ppp/iface.c
index ec57e4bbbf8..f780ab02539 100644
--- a/usr.sbin/ppp/iface.c
+++ b/usr.sbin/ppp/iface.c
@@ -38,6 +38,9 @@
 #include <sys/un.h>
 
 #include <errno.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/usr.sbin/ppp/ip.c b/usr.sbin/ppp/ip.c
index f1219d000d1..eb0b9edb90d 100644
--- a/usr.sbin/ppp/ip.c
+++ b/usr.sbin/ppp/ip.c
@@ -37,6 +37,9 @@
 #include <sys/un.h>
 
 #include <errno.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <string.h>
 #include <termios.h>
diff --git a/usr.sbin/ppp/ipcp.c b/usr.sbin/ppp/ipcp.c
index 3efb315d836..9fadaa463a7 100644
--- a/usr.sbin/ppp/ipcp.c
+++ b/usr.sbin/ppp/ipcp.c
@@ -36,6 +36,9 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <resolv.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdlib.h>
 #include <string.h>
 #include <termios.h>
diff --git a/usr.sbin/ppp/mp.c b/usr.sbin/ppp/mp.c
index 43c5829451c..d145252a312 100644
--- a/usr.sbin/ppp/mp.c
+++ b/usr.sbin/ppp/mp.c
@@ -37,6 +37,9 @@
 
 #include <errno.h>
 #include <paths.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/physical.c b/usr.sbin/ppp/physical.c
index 2ee96eb7471..290391b78b5 100644
--- a/usr.sbin/ppp/physical.c
+++ b/usr.sbin/ppp/physical.c
@@ -29,6 +29,9 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <paths.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/prompt.c b/usr.sbin/ppp/prompt.c
index 5e39f00ff5f..0ceadf0e278 100644
--- a/usr.sbin/ppp/prompt.c
+++ b/usr.sbin/ppp/prompt.c
@@ -33,6 +33,9 @@
 #include <sys/un.h>
 
 #include <errno.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/usr.sbin/ppp/radius.c b/usr.sbin/ppp/radius.c
index 366baec4594..a59342a85b8 100644
--- a/usr.sbin/ppp/radius.c
+++ b/usr.sbin/ppp/radius.c
@@ -36,6 +36,9 @@
 
 #include <errno.h>
 #include <radlib.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/route.c b/usr.sbin/ppp/route.c
index 688bcfe205b..530832ba40b 100644
--- a/usr.sbin/ppp/route.c
+++ b/usr.sbin/ppp/route.c
@@ -34,6 +34,9 @@
 #include <sys/un.h>
 
 #include <errno.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/server.c b/usr.sbin/ppp/server.c
index 0f6cb513e1a..2cf560a0199 100644
--- a/usr.sbin/ppp/server.c
+++ b/usr.sbin/ppp/server.c
@@ -33,6 +33,9 @@
 #include <sys/un.h>
 
 #include <errno.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <string.h>
 #include <sys/stat.h>
diff --git a/usr.sbin/ppp/tcp.c b/usr.sbin/ppp/tcp.c
index 7fd53a73ad6..04a1fffbadb 100644
--- a/usr.sbin/ppp/tcp.c
+++ b/usr.sbin/ppp/tcp.c
@@ -33,6 +33,9 @@
 #include <netdb.h>
 
 #include <errno.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/usr.sbin/ppp/tty.c b/usr.sbin/ppp/tty.c
index 2ca27cc691f..158fb5fa433 100644
--- a/usr.sbin/ppp/tty.c
+++ b/usr.sbin/ppp/tty.c
@@ -34,6 +34,9 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdlib.h>
 #include <string.h>
 #include <sysexits.h>
diff --git a/usr.sbin/ppp/tun.c b/usr.sbin/ppp/tun.c
index c35894a6c20..c45618f24c6 100644
--- a/usr.sbin/ppp/tun.c
+++ b/usr.sbin/ppp/tun.c
@@ -39,6 +39,9 @@
 #include <sys/un.h>
 
 #include <errno.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <string.h>
 #if defined(__OpenBSD__) || defined(__NetBSD__)
 #include <sys/ioctl.h>
diff --git a/usr.sbin/ppp/udp.c b/usr.sbin/ppp/udp.c
index 2a84eb6fd6a..59f6ceae74f 100644
--- a/usr.sbin/ppp/udp.c
+++ b/usr.sbin/ppp/udp.c
@@ -33,6 +33,9 @@
 #include <netdb.h>
 
 #include <errno.h>
+#ifdef __NetBSD__
+#include <signal.h>	/* for `errno' ?!? */
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>