maybe try this hint from feldenthorn:
You'd need to replace any instances of armv7l with whatever your output from the terminal command "uname -p" is.

(source: https://bit.diamonds/community/index.php/topic,85.msg510.html#msg510 )

thats not what feldenthorn said......

Check that scrypt-arm.S is listed under SOURCES in the qt.pro file.

Well I got firefox working (was seg faulting).
solution:
 apt-get remove firefox
 apt-get install firefox:armhf

But no luck with diamond-qt.

Now I can copy/paste from odroid command line

build/scrypt_mine.o: In function `scrypt(void const*, unsigned long, unsigned int*, void*)':
scrypt_mine.cpp:(.text+0x5c): undefined reference to `scrypt_core'
collect2: error: ld returned 1 exit status
Makefile:302: recipe for target 'diamond-qt' failed
make: *** [diamond-qt] Error 1

this is caused by scrypt_core() not being compiled.
src/scrypt-arm.S does not support aarch64 (armv8).  

From crashoverride on forum.odroid.com

I'll bet DMD foundation would post a bounty for someone to create src/srcypt-aarch64.S
here is src/srcypt-arm.S as a starting point: https://github.com/DMDcoin/Diamond/blob/master/src/scrypt-arm.S
This code is for arm 32 bit, needs to be translated to 64 bit ...

The other modifications to diamond.pro and src/makefile.unix are relativly simple just adding a few lines for aarch64 ...

If you are going to get one, they are sold-out until middle of April, however I found mine at USA distributor (may still be available there) http://ameridroid.com

Ubuntu 64 bit image for Odroid C2 is available here http://odroid.com/dokuwiki/doku.php?id=en:c2_release_linux_ubuntu

Debian 32 and 64 bit (ODROBIAN-Jessie-2.0-vanilla-s905.img.xz) image for Odroid C2 are available here http://forum.odroid.com/viewtopic.php?f=138&t=18771 (follow links to s905) http://oph.mdrjr.net/odrobian/images/s905/
For the Debian 32 version:

I think I'd prefer Debian myself as raspbian is based on it and has lots of support.  Ordered a microSD card reader/writer on e-bay so I can re-flash my card ... and run crashoveride ... see if uname -p returns armv7 ... if so at least it's a temporary solution for DMD.

If you have not ordered yet, much cheaper from manufacturer in Korea http://www.hardkernel.com/main/main.php
Shipping from Korea to Utah, USA is $16 FEDEX (I bought the 32G Ubuntu 64 eMMC 5 card, power supply, case from them).

On another subject: bitcoind 12.0 build just fine on aarch64

need scrypt-aarch64.S for it to really be a solution ...

scrypt-arm.S is taken from pooler cpuminer (pooler@litcoinpool.com) and he said:

I'm also working with OKtoshi on ROKOS for aarch64 however he does not have a board yet ...
https://bt.irlbtc.com/view/1084908.msg14308714#msg14308714

I'll bet DMD foundation would post a bounty for someone to create src/srcypt-aarch64.S
here is src/srcypt-arm.S as a starting point: https://github.com/DMDcoin/Diamond/blob/master/src/scrypt-arm.S

With the release of RPi 3 out and PINE64+ imminent, there is going to be a large demand for aarch64 support.
I'm lucky to have got the Odroid C2 board, they are sold-out till mid-April.  Specs are quite similar on all Only the Odroid C2 has 2 GHZ though

I PM'ed pallas too but have not got a reply, he's into stuff like this I think ...

Should PM wolf0 too

By the way, who is DMD wallet dev nowadays ... used to be danbi but we don't hear from him much at all ...

another review:
http://www.jeffgeerling.com/blog/2016/review-odroid-c2-compared-raspberry-pi-3-and-orange-pi-plus

@feldenthorn
If you can give me example C++ code for maybe I can create aarch64 assembly code from it (I have been looking at several arm 32 bit to aarch64 sites), may not be optimized to the max but just need to get wallet to build for now.  Hell of a way to learn LOL.
I can probably do a side-by-side C++ to assembly code and later tune it with loop un-rolling etc.

u could put C++ fallback code for scrypt_core() in scrypt_mine.cpp, this is where it is used and defined as extern "C".

Interesting... let all know how it works.... when arrives and set it up....

I am very excited about your results. I am sure, you will find a way for the "little" pocket.

steve

maybe this?
CHUWI Hi8 8 inch Windows 10/Android 4.4 Dual Boot Tablet PC, with Features of Intel Quad Core, Full HD 1920*1200 IPS Screen, 2G RAM/32G ROM and Winkey
http://www.amazon.com/Windows-Android-Tablet-Features-Screen/dp/B01AN6BBKI