diff --git a/package/avahi/Config.in b/package/avahi/Config.in
index 8ba33d5e7..e2f8c53f8 100644
--- a/package/avahi/Config.in
+++ b/package/avahi/Config.in
@@ -1,5 +1,7 @@
 config BR2_PACKAGE_AVAHI
 	bool "avahi"
+	# libdaemon uses fork()
+	depends on BR2_USE_MMU
 	select BR2_PACKAGE_GETTEXT if BR2_NEEDS_GETTEXT_IF_LOCALE
 	help
 	  Avahi is a system which facilitates service
diff --git a/package/ifplugd/Config.in b/package/ifplugd/Config.in
index 0311ad73e..cbb5128c4 100644
--- a/package/ifplugd/Config.in
+++ b/package/ifplugd/Config.in
@@ -1,5 +1,7 @@
 config BR2_PACKAGE_IFPLUGD
 	bool "ifplugd"
+	# libdaemon uses fork()
+	depends on BR2_USE_MMU
 	select BR2_PACKAGE_LIBDAEMON
 	help
 	  Ifplugd is a daemon which will automatically configure your
diff --git a/package/libdaemon/Config.in b/package/libdaemon/Config.in
index 69432630d..bfcedc196 100644
--- a/package/libdaemon/Config.in
+++ b/package/libdaemon/Config.in
@@ -1,5 +1,7 @@
 config BR2_PACKAGE_LIBDAEMON
 	bool "libdaemon"
+	# needs fork()
+	depends on BR2_USE_MMU
 	help
 	  libdaemon is a lightweight C library that eases the
 	  writing of UNIX daemons.
diff --git a/package/nss-mdns/Config.in b/package/nss-mdns/Config.in
index 485cfcd08..1df0ce4b3 100644
--- a/package/nss-mdns/Config.in
+++ b/package/nss-mdns/Config.in
@@ -1,5 +1,7 @@
 config BR2_PACKAGE_NSS_MDNS
 	bool "nss-mdns"
+	# libdaemon->avahi uses fork()
+	depends on BR2_USE_MMU
 	depends on BR2_TOOLCHAIN_EXTERNAL_GLIBC || BR2_TOOLCHAIN_CTNG_eglibc || BR2_TOOLCHAIN_CTNG_glibc
 	depends on BR2_PACKAGE_AVAHI_DAEMON
 	help
diff --git a/package/radvd/Config.in b/package/radvd/Config.in
index 90c1fd4cf..d0d9d7091 100644
--- a/package/radvd/Config.in
+++ b/package/radvd/Config.in
@@ -1,5 +1,7 @@
 config BR2_PACKAGE_RADVD
 	bool "radvd"
+	# libdaemon uses fork()
+	depends on BR2_USE_MMU
 	select BR2_PACKAGE_FLEX
 	select BR2_PACKAGE_FLEX_LIBFL
 	select BR2_PACKAGE_LIBDAEMON