libv4l: needs mmu

Fixes:
http://autobuild.buildroot.net/results/989/989d32f3532283817e9439aa78cceff5983dc421/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

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

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"