fluxbox: uses fork(), not available on noMMU platforms

fluxbox uses the fork() system call, not available on noMMU
platforms. It's also fairly unlikely to have to use a full-blown
X.org window manager on such platforms.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/fluxbox/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_FLUXBOX
 	bool "fluxbox"
 	depends on BR2_PACKAGE_XORG7
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_XLIB_LIBX11
 	# Runtime dependency, needed by startup script
 	select BR2_PACKAGE_XAPP_XMODMAP
@@ -11,4 +12,5 @@ config BR2_PACKAGE_FLUXBOX
 	  http://fluxbox.org
 
 comment "fluxbox needs a toolchain w/ C++"
+	depends on BR2_USE_MMU
 	depends on BR2_PACKAGE_XORG7 && !BR2_INSTALL_LIBSTDCPP