Building go application with jemalloc errors out

Hi @joshua,

I cloned the dgraph-io/badger repository and executed make badger command which resulted in same error:

Compiling Badger binary...
# github.com/dgraph-io/ristretto/z
/go/pkg/mod/github.com/dgraph-io/ristretto@v0.1.1/z/calloc_jemalloc.go:73:9: could not determine kind of name for C.je_calloc
/go/pkg/mod/github.com/dgraph-io/ristretto@v0.1.1/z/calloc_jemalloc.go:103:3: could not determine kind of name for C.je_free
/go/pkg/mod/github.com/dgraph-io/ristretto@v0.1.1/z/calloc_jemalloc.go:143:2: could not determine kind of name for C.je_mallctl
/go/pkg/mod/github.com/dgraph-io/ristretto@v0.1.1/z/calloc_jemalloc.go:170:2: could not determine kind of name for C.je_malloc_stats_print
make[1]: *** [badger] Error 2
make: *** [badger] Error 2

It would be awesome, if you can guide us with the exact steps on how to build DGraph with MacOS and explicitly mention any external dependencies required separately.

Thanks!