missing crypt on glibc 2.31 about dropbear HOT 4 CLOSED

Since libcrypt is standalone you will need to install the armhf dev packages too.
From https://wiki.debian.org/Multiarch/HOWTO

dpkg --add-architecture armhf

Add these to /etc/apt/sources.list.d (the normal mirrors don't seem to have armhf)

deb [arch=armhf] http://ports.ubuntu.com/ focal main restricted
deb [arch=armhf] http://ports.ubuntu.com/ focal-updates main restricted

apt-get update (there may be 404s from armhf not existing on the normal mirror, you can probably solve that by adding [arch=amd64] to those lines in /etc/apt/sources.list)

apt install libcrypt-dev:armhf

Then Dropbear configure should run successfully.

from dropbear.

I use another solution:

1. download standalone libcrypt from https://github.com/besser82/libxcrypt/
2. cross compile it with the following configurations (install to the cross-compiler directory):

   tar -xvf libxcrypt-4.4.28.tar.xz  
   cd libxcrypt-4.4.28
   ./configure --prefix=/usr/arm-linux-gnueabihf  CC=arm-linux-gnueabihf-gcc \
   --host=arm
   

3. compile dropbear

Environment:

• dropbear-dropbear-2022.82
• libxcrypt-4.4.28
• arm-linux-gnueabihf-gcc 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)

from dropbear.

I used the two approaches in the answer. I am still getting the same error. What information can I provide further in order to fix these issues?

from dropbear.

mkj's solution worked for me. Are you building on Focal or Jammy host @harpreetsc1992?

from dropbear.