[code]
$ ldd /usr/bin/mbsync|nvim
linux-vdso.so.1 (0x0000ffff88527000)
libdb-6.2.so => not found
libssl.so.3 => /usr/lib/libssl.so.3 (0x0000ffff88330000)
libcrypto.so.3 => /usr/lib/libcrypto.so.3 (0x0000ffff87d30000)
libsasl2.so.3 => /usr/lib/libsasl2.so.3 (0x0000ffff87cf0000)
libz.so.1 => /usr/lib/libz.so.1 (0x0000ffff87cc0000)
libc.so.6 => /usr/lib/libc.so.6 (0x0000ffff87b10000)
/lib/ld-linux-aarch64.so.1 => /usr/lib/ld-linux-aarch64.so.1 (0x0000ffff884e0000)
[/code]
But db (Berkeley DB) is not a dependency for isync. I installed isync with the regular pacman -S isync.