diff --git a/package/gpsd/Config.in b/package/gpsd/Config.in
index 5e60bb0d6..d387abdd9 100644
--- a/package/gpsd/Config.in
+++ b/package/gpsd/Config.in
@@ -1,5 +1,7 @@
 config BR2_PACKAGE_GPSD
 	bool "gpsd"
+	# Uses fork()
+	depends on BR2_USE_MMU
 	help
 	  gpsd is a service daemon that monitors one or more GPSes or AIS
 	  receivers attached to a host computer through serial or USB ports,
diff --git a/package/input-event-daemon/Config.in b/package/input-event-daemon/Config.in
index edf288609..84177fd8f 100644
--- a/package/input-event-daemon/Config.in
+++ b/package/input-event-daemon/Config.in
@@ -1,5 +1,7 @@
 config BR2_PACKAGE_INPUT_EVENT_DAEMON
 	bool "input-event-daemon"
+	# Uses fork()
+	depends on BR2_USE_MMU
 	help
 	  input-event-daemon is a daemon which executes
 	  a user-defined command on input events, such as
diff --git a/package/kbd/Config.in b/package/kbd/Config.in
index 1fe4dff83..a23b70a81 100644
--- a/package/kbd/Config.in
+++ b/package/kbd/Config.in
@@ -2,6 +2,8 @@ config BR2_PACKAGE_KBD
 	bool "kbd"
 	select BR2_PACKAGE_GETTEXT if BR2_NEEDS_GETTEXT_IF_LOCALE
 	select BR2_PACKAGE_LIBINTL if BR2_NEEDS_GETTEXT_IF_LOCALE
+	# Uses fork()
+	depends on BR2_USE_MMU
 	help
 	  Keytable files and keyboard utilities.
 
diff --git a/package/setserial/Config.in b/package/setserial/Config.in
index 2f6d6eea8..cffe50ef0 100644
--- a/package/setserial/Config.in
+++ b/package/setserial/Config.in
@@ -1,4 +1,6 @@
 config BR2_PACKAGE_SETSERIAL
 	bool "setserial"
+	# Uses fork()
+	depends on BR2_USE_MMU
 	help
 	     Setserial : configuration of serial ports
diff --git a/package/sysstat/Config.in b/package/sysstat/Config.in
index 28274d93e..6e62ff158 100644
--- a/package/sysstat/Config.in
+++ b/package/sysstat/Config.in
@@ -2,6 +2,8 @@ config BR2_PACKAGE_SYSSTAT
 	bool "sysstat"
 	select BR2_PACKAGE_GETTEXT if BR2_NEEDS_GETTEXT_IF_LOCALE
 	select BR2_PACKAGE_LIBINTL if BR2_NEEDS_GETTEXT_IF_LOCALE
+	# Uses fork()
+	depends on BR2_USE_MMU
 	help
           The sysstat utilities are a collection of performance
           monitoring tools for Linux. These include sar, sadf, mpstat,