[john-users] OpenCL not found?

[Steve Bourland]

I am trying to compile john with OpenCL support on a Gizmosphere Gizmo2
under Ubuntu 16.04 (this is just my test platform). The problem I am
having is that ./configure is not indicating OpenCL is supported. Here is
some hopefully helpful information:

./configure LDFLAGS=-L/opt/AMDAPPSDK-3.0/lib
CFLAGS=-I/opt/AMDAPPSDK-3.0/include

Yields:
OpenCL support ......................... no

locate CL/cl.h
/opt/AMDAPPSDK-3.0/include/CL/cl.h
/opt/AMDAPPSDK-3.0/include/CL/cl.hpp

locate libOpenCL.so
/opt/AMDAPPSDK-3.0/lib/x86/libOpenCL.so
/opt/AMDAPPSDK-3.0/lib/x86/libOpenCL.so.1
/opt/AMDAPPSDK-3.0/lib/x86_64/libOpenCL.so
/opt/AMDAPPSDK-3.0/lib/x86_64/sdk/libOpenCL.so
/opt/AMDAPPSDK-3.0/lib/x86_64/sdk/libOpenCL.so.1

I feel like I have everything in order per the README-OPENCL. Trying
make -sf Makefile.legacy was disasterous, leading to a constantly
increasing load (I killed it at >185) and chewing through swap space.
Does anyone have any clues or suggestions?
Thanks,
Steve