Seems that the build fails for some staging driver of a Hardkernel TFT screen. I disabled this in my config and that avoids the problem, but I guess this is something that needs a fix if somebody wants to use this TFT screen from Hardkernel with ODROIDs?
AR drivers/iio/potentiostat/built-in.a
CC [M] drivers/target/target_core_ua.o
CC [M] drivers/staging/rtl8723bs/hal/rtl8723b_dm.o
CC [M] drivers/hid/hid-prodikeys.o
CC [M] drivers/staging/fbtft/fb_upd161704.o
CC [M] drivers/staging/rtl8188eu/hal/rtl8188eu_xmit.o
CC [M] drivers/target/target_core_rd.o
AR drivers/iio/pressure/built-in.a
CC [M] drivers/bluetooth/bcm203x.o
CC [M] drivers/iio/pressure/bmp280-core.o
CC [M] drivers/hid/hid-pl.o
make[3]: *** No rule to make target 'drivers/staging/fbtft/fb_hktft35.o', needed by 'drivers/staging/fbtft/fb_hktft35.mod'. Stop.
make[3]: *** Waiting for unfinished jobs....
CC [M] drivers/staging/fbtft/fb_watterott.o
AR drivers/iio/proximity/built-in.a
CC [M] drivers/staging/rtl8188eu/hal/usb_halinit.o
CC [M] drivers/iio/proximity/ping.o
CC [M] drivers/target/target_core_stat.o
CC [M] drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.o
CC [M] drivers/hid/hid-penmount.o
CC [M] drivers/iio/pressure/bmp280-regmap.o
make[2]: *** [scripts/Makefile.build:515: drivers/staging/fbtft] Error 2
make[2]: *** Waiting for unfinished jobs....
CC [M] drivers/iio/pressure/bmp280-i2c.o
CC [M] drivers/bluetooth/bpa10x.o
CC [M] drivers/target/target_core_xcopy.o
CC [M] drivers/staging/rtl8723bs/hal/rtl8723b_phycfg.o
CC [M] drivers/iio/proximity/sx9310.o
CC [M] drivers/hid/hid-petalynx.o
CC [M] drivers/target/target_core_iblock.o
CC [M] drivers/iio/pressure/bmp280-spi.o
CC [M] drivers/staging/rtl8188eu/os_dep/ioctl_linux.o
CC [M] drivers/bluetooth/bfusb.o
CC [M] drivers/bluetooth/btusb.o
CC [M] drivers/hid/hid-picolcd_core.o
CC [M] drivers/target/target_core_file.o
CC [M] drivers/iio/pressure/dlhl60d.o
CC [M] drivers/iio/proximity/vcnl3020.o
CC [M] drivers/staging/rtl8723bs/hal/rtl8723b_rf6052.o
CC [M] drivers/staging/rtl8188eu/os_dep/mlme_linux.o
CC [M] drivers/hid/hid-picolcd_fb.o
CC [M] drivers/iio/pressure/dps310.o
CC [M] drivers/target/target_core_pscsi.o
CC [M] drivers/bluetooth/btsdio.o
LD [M] drivers/target/target_core_mod.o
CC [M] drivers/staging/rtl8188eu/os_dep/mon.o
CC [M] drivers/staging/rtl8723bs/hal/rtl8723b_rxdesc.o
CC [M] drivers/staging/rtl8723bs/hal/rtl8723bs_recv.o
CC [M] drivers/iio/pressure/hid-sensor-press.o
CC [M] drivers/hid/hid-picolcd_backlight.o
CC [M] drivers/iio/pressure/icp10100.o
CC [M] drivers/bluetooth/btintel.o
CC [M] drivers/staging/rtl8723bs/hal/rtl8723bs_xmit.o
CC [M] drivers/mux/core.o
CC [M] drivers/hid/hid-picolcd_lcd.o
CC [M] drivers/most/core.o
CC [M] drivers/staging/rtl8188eu/os_dep/os_intfs.o
AR drivers/iio/resolver/built-in.a
CC [M] drivers/staging/rtl8188eu/os_dep/osdep_service.o
CC [M] drivers/bluetooth/ath3k.o
CC [M] drivers/staging/rtl8723bs/hal/sdio_halinit.o
CC [M] drivers/hid/hid-picolcd_leds.o
LD [M] drivers/iio/pressure/bmp280.o
CC [M] drivers/bluetooth/btmrvl_main.o
CC [M] drivers/mux/adg792a.o
AR drivers/iio/temperature/built-in.a
CC [M] drivers/iio/temperature/iqs620at-temp.o
CC [M] drivers/staging/rtl8723bs/hal/sdio_ops.o
CC [M] drivers/hid/hid-picolcd_cir.o
CC [M] drivers/iio/temperature/ltc2983.o
CC [M] drivers/bluetooth/btmrvl_debugfs.o
CC [M] drivers/staging/rtl8188eu/os_dep/recv_linux.o
CC [M] drivers/iio/temperature/hid-sensor-temperature.o
CC [M] drivers/staging/rtl8723bs/hal/HalBtc8723b1Ant.o
CC [M] drivers/hid/hid-picolcd_debugfs.o
CC [M] drivers/bluetooth/btmtksdio.o
CC [M] drivers/staging/rtl8188eu/os_dep/rtw_android.o
CC [M] drivers/hid/hid-plantronics.o
CC [M] drivers/staging/rtl8723bs/hal/HalBtc8723b2Ant.o
CC [M] drivers/hid/hid-playstation.o
CC [M] drivers/staging/rtl8188eu/os_dep/usb_intf.o
AR drivers/iio/test/built-in.a
CC [M] drivers/bluetooth/btbcm.o
CC [M] drivers/staging/rtl8188eu/os_dep/usb_ops_linux.o
CC [M] drivers/hid/hid-primax.o
CC [M] drivers/staging/rtl8723bs/hal/HalHWImg8723B_BB.o
AR drivers/iio/trigger/built-in.a
CC drivers/iio/industrialio-core.o
CC [M] drivers/hid/hid-retrode.o
CC [M] drivers/bluetooth/btrtl.o
CC [M] drivers/staging/rtl8188eu/os_dep/xmit_linux.o
CC [M] drivers/hid/hid-roccat.o
CC drivers/iio/industrialio-event.o
CC [M] drivers/staging/rtl8723bs/hal/HalHWImg8723B_MAC.o
LD [M] drivers/bluetooth/hci_uart.o
LD [M] drivers/bluetooth/btmrvl.o
LD [M] drivers/staging/rtl8188eu/r8188eu.o
CC [M] drivers/hid/hid-roccat-common.o
CC drivers/iio/inkern.o
CC [M] drivers/mux/adgs1408.o
CC [M] drivers/staging/rtl8723bs/hal/HalHWImg8723B_RF.o
CC drivers/iio/industrialio-buffer.o
CC [M] drivers/hid/hid-roccat-arvo.o
CC [M] drivers/mux/gpio.o
CC [M] drivers/staging/rtl8723bs/hal/HalPhyRf_8723B.o
CC drivers/iio/industrialio-trigger.o
CC [M] drivers/hid/hid-roccat-isku.o
CC [M] drivers/iio/industrialio-triggered-event.o
CC [M] drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.o
AR drivers/iio/built-in.a
CC [M] drivers/hid/hid-roccat-kone.o
CC [M] drivers/most/configfs.o
CC [M] drivers/hid/hid-roccat-koneplus.o
CC [M] drivers/hid/hid-roccat-konepure.o
CC [M] drivers/staging/rtl8723bs/os_dep/ioctl_linux.o
CC [M] drivers/staging/rtl8723bs/os_dep/mlme_linux.o
LD [M] drivers/mux/mux-core.o
CC [M] drivers/mux/mmio.o
LD [M] drivers/mux/mux-adg792a.o
CC [M] drivers/most/most_usb.o
CC [M] drivers/hid/hid-roccat-kovaplus.o
CC [M] drivers/staging/rtl8723bs/os_dep/osdep_service.o
CC [M] drivers/hid/hid-roccat-lua.o
CC [M] drivers/vhost/vhost.o
CC [M] drivers/hid/hid-roccat-pyra.o
CC [M] drivers/staging/rtl8723bs/os_dep/os_intfs.o
CC [M] drivers/staging/rtl8723bs/os_dep/recv_linux.o
CC [M] drivers/hid/hid-roccat-ryos.o
CC [M] drivers/most/most_cdev.o
CC [M] drivers/hid/hid-roccat-savu.o
CC [M] drivers/staging/rtl8723bs/os_dep/sdio_intf.o
CC [M] drivers/hid/hid-rmi.o
CC [M] drivers/staging/rtl8723bs/os_dep/sdio_ops_linux.o
CC [M] drivers/hid/hid-saitek.o
CC [M] drivers/comedi/range.o
CC [M] drivers/comedi/drivers.o
CC [M] drivers/staging/rtl8723bs/os_dep/wifi_regd.o
CC [M] drivers/hid/hid-samsung.o
CC [M] drivers/staging/rtl8723bs/os_dep/xmit_linux.o
LD [M] drivers/mux/mux-gpio.o
LD [M] drivers/mux/mux-adgs1408.o
CC [M] drivers/comedi/comedi_buf.o
CC [M] drivers/hid/hid-sjoy.o
LD [M] drivers/staging/rtl8723bs/r8723bs.o
make[1]: *** [scripts/Makefile.build:515: drivers/staging] Error 2
make[1]: *** Waiting for unfinished jobs....
CC [M] drivers/hid/hid-sony.o
CC [M] drivers/comedi/proc.o
LD [M] drivers/mux/mux-mmio.o
CC [M] drivers/vhost/iotlb.o
CC [M] drivers/hid/hid-speedlink.o
CC [M] drivers/hid/hid-steelseries.o
LD [M] drivers/vhost/vhost_scsi.o
CC [M] drivers/hid/hid-sunplus.o
LD [M] drivers/vhost/vhost_vdpa.o
CC [M] drivers/hid/hid-gaff.o
LD [M] drivers/most/most_core.o
CC [M] drivers/hid/hid-tmff.o
CC [M] drivers/hid/hid-thrustmaster.o
CC [M] drivers/hid/hid-tivo.o
CC [M] drivers/hid/hid-topseed.o
CC [M] drivers/hid/hid-twinhan.o
CC [M] drivers/hid/hid-u2fzero.o
CC [M] drivers/hid/hid-uclogic-core.o
CC [M] drivers/hid/hid-uclogic-params.o
CC [M] drivers/hid/hid-uclogic-rdesc.o
CC [M] drivers/hid/hid-udraw-ps3.o
CC [M] drivers/hid/hid-led.o
CC [M] drivers/hid/hid-xinmo.o
CC [M] drivers/hid/hid-zpff.o
CC [M] drivers/hid/hid-zydacron.o
CC [M] drivers/hid/hid-viewsonic.o
CC [M] drivers/hid/wacom_wac.o
CC [M] drivers/hid/wacom_sys.o
CC [M] drivers/hid/hid-waltop.o
CC [M] drivers/hid/hid-wiimote-core.o
CC [M] drivers/hid/hid-wiimote-modules.o
CC [M] drivers/hid/hid-wiimote-debug.o
CC [M] drivers/hid/hid-sensor-hub.o
LD [M] drivers/vhost/vhost_iotlb.o
CC [M] drivers/hid/hid-sensor-custom.o
LD [M] drivers/hid/hid-logitech.o
LD [M] drivers/hid/hid-picolcd.o
LD [M] drivers/hid/hid-uclogic.o
LD [M] drivers/hid/wacom.o
AR drivers/hid/built-in.a
LD [M] drivers/hid/hid-wiimote.o
LD [M] drivers/comedi/comedi.o
make: *** [Makefile:1847: drivers] Error 2
make: *** Waiting for unfinished jobs....
GZIP kernel/config_data.gz
CC [M] kernel/kheaders.o
CC kernel/configs.o
AR kernel/built-in.a
Seems that the build fails for some staging driver of a Hardkernel TFT screen. I disabled this in my config and that avoids the problem, but I guess this is something that needs a fix if somebody wants to use this TFT screen from Hardkernel with ODROIDs?