Make X11 optional

buildroot_config_fragment

@@ -75,22 +75,3 @@ BR2_PACKAGE_HOST_DTC=y
 # which for our pci_min device fires interrupts.
 #
 BR2_PACKAGE_PCIUTILS=y
-
-# X11
-# https://unix.stackexchange.com/questions/70931/how-to-install-x11-on-my-own-linux-buildroot-system/306116#306116
-BR2_PACKAGE_XAPP_TWM=y
-BR2_PACKAGE_XAPP_XCALC=y
-BR2_PACKAGE_XAPP_XCLOCK=y
-BR2_PACKAGE_XAPP_XEYES=y
-BR2_PACKAGE_XAPP_XINIT=y
-BR2_PACKAGE_XDRIVER_XF86_INPUT_KEYBOARD=y
-BR2_PACKAGE_XDRIVER_XF86_INPUT_MOUSE=y
-BR2_PACKAGE_XDRIVER_XF86_VIDEO_CIRRUS=y
-BR2_PACKAGE_XDRIVER_XF86_VIDEO_FBDEV=y
-BR2_PACKAGE_XDRIVER_XF86_VIDEO_VESA=y
-BR2_PACKAGE_XORG7=y
-BR2_PACKAGE_XSERVER_XORG_SERVER=y
-BR2_PACKAGE_XTERM=y
-BR2_TOOLCHAIN_BUILDROOT_CXX=y
-BR2_TOOLCHAIN_BUILDROOT_WCHAR=y
-BR2_USE_WCHAR=y

buildroot_config_fragment_x11

@@ -0,0 +1,18 @@
+# X11
+# https://unix.stackexchange.com/questions/70931/how-to-install-x11-on-my-own-linux-buildroot-system/306116#306116
+BR2_PACKAGE_XAPP_TWM=y
+BR2_PACKAGE_XAPP_XCALC=y
+BR2_PACKAGE_XAPP_XCLOCK=y
+BR2_PACKAGE_XAPP_XEYES=y
+BR2_PACKAGE_XAPP_XINIT=y
+BR2_PACKAGE_XDRIVER_XF86_INPUT_KEYBOARD=y
+BR2_PACKAGE_XDRIVER_XF86_INPUT_MOUSE=y
+BR2_PACKAGE_XDRIVER_XF86_VIDEO_CIRRUS=y
+BR2_PACKAGE_XDRIVER_XF86_VIDEO_FBDEV=y
+BR2_PACKAGE_XDRIVER_XF86_VIDEO_VESA=y
+BR2_PACKAGE_XORG7=y
+BR2_PACKAGE_XSERVER_XORG_SERVER=y
+BR2_PACKAGE_XTERM=y
+BR2_TOOLCHAIN_BUILDROOT_CXX=y
+BR2_TOOLCHAIN_BUILDROOT_WCHAR=y
+BR2_USE_WCHAR=y

run

@@ -2,6 +2,7 @@
 set -e
 arch='x86_64'
 extra_targets=''
+x11=false
 while getopts a:t: OPT > /dev/null 2>&1; do
   case "$OPT" in
     'a')
@@ -10,6 +11,9 @@ while getopts a:t: OPT > /dev/null 2>&1; do
     't')
       extra_targets="$extra_args $OPTARG"
     ;;
+    'x')
+      x11=true
+    ;;
   esac
 done
 case "$arch" in
@@ -40,6 +44,9 @@ make O="$outdir" BR2_EXTERNAL="$(pwd)/../kernel_module" "$defconfig"
 # TODO Can't get rid of this for now.
 # http://stackoverflow.com/questions/44078245/is-it-possible-to-use-config-fragments-with-buildroots-config
 cat ../buildroot_config_fragment >> "${outdir}/.config"
+if $x11; then
+  cat ../buildroot_config_fragment_x11 >> "${outdir}/.config"
+fi
 make O="$outdir" olddefconfig
 # HOST_QEMU_OPTS is a hack that happens to work because the QEMU package luckly uses += at all times.
 # It shouldn't be necessary in the first place: https://bugs.busybox.net/show_bug.cgi?id=9936

runqemu

@@ -12,7 +12,7 @@ nographic=false
 # printk.time=y: log in format: "[time ] msg" for all printk messages.
 extra_append='norandmaps printk.devkmsg=on printk.time=y'
 extra_flags=''
-while getopts a:de:knqt: OPT; do
+while getopts a:de:knqt:x OPT; do
   case "$OPT" in
     a)
       arch="$OPTARG"

x11.md

@@ -1,6 +1,14 @@
 # X11
 
-Only tested successfully in `x86_64`:
+Only tested successfully in `x86_64`.
+
+Build:
+
+    ./run -x
+
+We don't build X11 by default because it takes a considerable amount of time, and is not expected to be used by most users.
+
+Inside QEMU:
 
     startx