please let me know if you're able to build a fast miner :-), have exactly same hardware ...., I was able to build zcash orginal repo but received 0 h/s while mining.

Had also this error:

g++  -std=c++11 -fpermissive -g -O2 -pthread  -o minerd minerd-cpu-miner.o minerd-util.o minerd-sha2.o minerd-equihash.o    minerd-sha2-ppc.o -L/usr/lib/powerpc64le-linux-gnu -lcurl compat/jansson/libjansson.a -lpthread  -lsodium
minerd-sha2.o: In function `sha256d_80_swap(unsigned int*, unsigned int const*)':
/home/gh0sT/cpuminer-zcash/sha2.cpp:193: undefined reference to `sha256_transform(unsigned int*, unsigned int const*, int)'
/home/gh0sT/cpuminer-zcash/sha2.cpp:194: undefined reference to `sha256_transform(unsigned int*, unsigned int const*, int)'
/home/gh0sT/cpuminer-zcash/sha2.cpp:197: undefined reference to `sha256_transform(unsigned int*, unsigned int const*, int)'
.......

I've the possibility to run a mining software on many Power8 CPUs ;-), but your setting also look nice ...