To run all the benchmarks, first download and install pHash.
I installed pHash with cpkg, viz.
cpkg install pHash -vv LD_LIBRARY_PATH=$(cpkg dump ld-path pHash) PKG_CONFIG_PATH=$(cpkg dump pkg-config pHash) cabal new-bench --constraint='perceptual-hash +with-phash' --constraint='perceptual-hash +llvm'