diff --git a/package/libv4l/Config.in b/package/libv4l/Config.in
index 9d0492187..2c9a9192f 100644
--- a/package/libv4l/Config.in
+++ b/package/libv4l/Config.in
@@ -2,6 +2,7 @@ config BR2_PACKAGE_LIBV4L
 	bool "libv4l"
 	depends on BR2_LARGEFILE
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_JPEG
 	help
 	  libv4l is an accompanying collection of libraries that adds a thin
@@ -61,3 +62,4 @@ endif
 
 comment "libv4l needs a toolchain w/ largefile, threads"
 	depends on !BR2_LARGEFILE || !BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_MMU
diff --git a/package/opencv/Config.in b/package/opencv/Config.in
index 49ada5d16..f9ee416e7 100644
--- a/package/opencv/Config.in
+++ b/package/opencv/Config.in
@@ -189,12 +189,14 @@ config BR2_PACKAGE_OPENCV_WITH_V4L
 	bool "v4l support"
 	depends on BR2_LARGEFILE
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_MMU # libv4l fork
 	select BR2_PACKAGE_LIBV4L
 	help
 	  Enable Video 4 Linux support.
 
 comment "v4l support needs a toolchain w/ largefile, threads"
 	depends on !BR2_LARGEFILE || !BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_MMU
 
 comment "Install options"