Build error while following directions in selfsigned.md

[umop]

I am trying to follow the instructions in https://github.com/cryptoadvance/specter-bootloader/blob/master/doc/selfsigned.md in order to build a bootloader. I don't care about replacing the bootloader public keys, so I just copied the source from keys/test into keys/selfsigned since the readme said to use it as an example. However, I get the following error when trying to build:

specter-bootloader %  make stm32f469disco
make[1]: Nothing to be done for `all'.
arm-none-eabi-gcc -c -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=hard -DPLATFORM_ID=\"stm32f469disco\" -DUSE_HAL_DRIVER -DSTM32F469xx -DHAVE_CONFIG_H -DSECP256K1_BUILD -D__BYTE_ORDER=1234 -DCRC32_USE_LOOKUP_TABLE_SLICING_BY_8 -I/Users/umop/projects/safe-message/specter-bootloader/platforms/stm32f469disco/bootloader -I/Users/umop/projects/safe-message/specter-bootloader/platforms/stm32f469disco/bootloader/config -I/Users/umop/projects/safe-message/specter-bootloader/platforms/stm32f469disco/common -I/Users/umop/projects/safe-message/specter-bootloader/core -I/Users/umop/projects/safe-message/specter-bootloader/core/config -I/Users/umop/projects/safe-message/specter-bootloader/core/secp256k1_add -I/Users/umop/projects/safe-message/specter-bootloader/platforms/stm32f469disco/drivers/CMSIS/Include -I/Users/umop/projects/safe-message/specter-bootloader/platforms/stm32f469disco/drivers/CMSIS/Device/ST/STM32F4xx/Include -I/Users/umop/projects/safe-message/specter-bootloader/platforms/stm32f469disco/drivers/STM32F4xx_HAL_Driver/Inc -I/Users/umop/projects/safe-message/specter-bootloader/platforms/stm32f469disco/drivers/BSP/STM32469I-Discovery -I/Users/umop/projects/safe-message/specter-bootloader/lib/crc32 -I/Users/umop/projects/safe-message/specter-bootloader/platforms/stm32f469disco/drivers/fatfs_io -I/Users/umop/projects/safe-message/specter-bootloader/lib/fatfs/source -I/Users/umop/projects/safe-message/specter-bootloader/lib/crypto -I/Users/umop/projects/safe-message/specter-bootloader/lib/secp256k1 -I/Users/umop/projects/safe-message/specter-bootloader/lib/secp256k1/src -I/Users/umop/projects/safe-message/specter-bootloader/lib/secp256k1/include -I/Users/umop/projects/safe-message/specter-bootloader/lib/bech32 -Os -Wall -Wno-unused-function -fdata-sections -ffunction-sections -MMD -MP -Werror -MF"/Users/umop/projects/safe-message/specter-bootloader/build/stm32f469disco/bootloader/release/bl_syscalls.d" -Wa,-a,-ad,-alms=/Users/umop/projects/safe-message/specter-bootloader/build/stm32f469disco/bootloader/release/bl_syscalls.lst /Users/umop/projects/safe-message/specter-bootloader/platforms/stm32f469disco/bootloader/bl_syscalls.c -o /Users/umop/projects/safe-message/specter-bootloader/build/stm32f469disco/bootloader/release/bl_syscalls.o
In file included from /Users/umop/projects/safe-message/specter-bootloader/platforms/stm32f469disco/bootloader/bl_syscalls.c:20:
/Users/umop/projects/safe-message/specter-bootloader/core/bl_syscalls.h:20:10: fatal error: ff.h: No such file or directory
   20 | #include "ff.h"
      |          ^~~~~~
compilation terminated.
make[1]: *** [/Users/umop/projects/safe-message/specter-bootloader/build/stm32f469disco/bootloader/release/bl_syscalls.o] Error 1
make: *** [stm32f469disco] Error 2

Is there a step I'm missing here?

[stepansnigirev]

Maybe you didn't clone submodules?
Try running
git submodule update --init --recursive

[umop]

That was it! I didn't realize there were submodules. Thanks!