Micropython for Pico won't build

[hippy]

Fresh git clone install ...

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GEN /home/pi/pico/micropython/ports/rp2/build/genhdr/mpversion.h
[  4%] Generating genhdr/moduledefs.h
[  5%] Generating genhdr/qstr.i.last
/home/pi/pico/micropython/extmod/moduhashlib.c:35:10: fatal error: mbedtls/version.h: No such file or directory
 #include "mbedtls/version.h"
          ^~~~~~~~~~~~~~~~~~~
compilation terminated.
/home/pi/pico/micropython/extmod/moducryptolib.c:64:10: fatal error: mbedtls/aes.h: No such file or directory
 #include <mbedtls/aes.h>
          ^~~~~~~~~~~~~~~
compilation terminated.

[pythoncoder]

Did you do

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make submodules
make BOARD=PICO

[hippy]

Did you do

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make submodules
make BOARD=PICO

No, I did neither.

The official Raspberry Pi Getting Started documentation doesn't detail the need to do that and I have always used CMake to build MicroPython from source for the Pico and RP2040 rather than 'make'.

The three solutions appear to be -

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cd ~/pico/micropython/ports/rp2
make submodules 

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cd ~/pico/micropython
git submodule update --init -- lib/mbedtls

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cd ~/pico/micropython
git submodule update --init

[Pauldow]

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cd ~/pico/micropython
git submodule update --init -- lib/mbdedtls

I am just starting with this, but I got a Did not match any files error with that git command.
Should it be?
git submodule update --init -- lib/mbedtls

[Roberthh]

I use in that case:

git submodule update --init lib/mbdedtls

[hippy]

Should it be?
git submodule update --init -- lib/mbedtls

Indeed it should. Apologies for that, I should have copy-and-pasted rather than typing in to the post. Thanks for letting me know and I have updated my post.

I have no idea what the '--' is for, what purpose it serves. I just copied someone else's example.

[scruss]

I have no idea what the '--' is for, what purpose it serves. I just copied someone else's example.

-- is gnuish (possibly posix, too) for "there are no options after this". Some people consider it polite to put into examples, but the only real use I've found for it is removing files called something like -file