107e030723552cf272dc8da01bb682032a457a3d build: make protobuf optional in depends (fanquake)
ff6122f32b21fa00e9308e098b33b9657debc1d7 doc: clarify protobuf build requirements (fanquake)
Pull request description:
As mentioned by dongcarl in https://github.com/bitcoin/bitcoin/pull/15584#issuecomment-521780972, make building `protobuf` optional in depends. With this change it will only be built if you pass `PROTOBUF=1`.
ACKs for top commit:
laanwj:
code review ACK 107e030723552cf272dc8da01bb682032a457a3d
Sjors:
tACK 107e030 on macOS 10.14. When I build depends with `PROTOBUF=1` then `./configure` has `bip70` enabled.
Tree-SHA512: 49bc247a6879aaf55b943a3d0b930544ddef1e69a481955a8bebe0b02c9ad0fe168b93025f34168334cef34bb567478eb98eacab62ba909f2f64fb21119c71b8