2020-05-30, 12:51 #323 rogue     "Mark" Apr 2003 Between here and the 2×11×269 Posts I really messed up the makefile for GPU builds. You need this line: GCW_GPU_OBJS=cullen_woodall/CullenWoodallApp_gpu.o cullen_woodall/CullenWoodallWorker.o cullen_woodall/CullenWoodallGpuWorker_gpu.o and this line: gcwsievecl: $(GPU_CORE_OBJS)$(PRIMESIEVE_OBJS) $(ASM_OBJS)$(GCW_GPU_OBJS) $(CC)$(CPPFLAGS) $(LDFLAGS) -o$@ $^$(GPULDFLAGS) \$(EXTRALDFLAGS) to get a clean build. I haven't tested it yet, but I know that I have to fix the other OpenCL exes. Thanks for the find. BTW, I just committed an updated makefile that should fix all OpenCL exes. Last fiddled with by rogue on 2020-05-30 at 13:02