message: doc: update FreeBSD build guide for 12.0
diff: FreeBSD build guide
  ======================
  -(updated for FreeBSD 11.1)
  +(updated for FreeBSD 12.0)
  This guide describes how to build bitcoind and command-line utilities on FreeBSD.
  @@ -10,55 +10,51 @@ This guide does not contain instructions for building the GUI.
  You will need the following dependencies, which can be installed as root via pkg:
  -```
  +```shell
  pkg install autoconf automake boost-libs git gmake libevent libtool openssl pkgconf
  +
  +git clone https://github.com/bitcoin/bitcoin.git
  ```
  In order to run the test suite (recommended), you will need to have Python 3 installed:
  -```
  +```shell
  pkg install python3
  ```
  -For the wallet (optional):
  -```
  -./contrib/install_db4.sh `pwd`
  -export BDB_PREFIX="$PWD/db4"
  -```
  -
  See [dependencies.md](dependencies.md) for a complete overview.
  -Download the source code:
  -```
  -git clone https://github.com/bitcoin/bitcoin
  +### Building BerkeleyDB
  +
  +BerkeleyDB is only necessary for the wallet functionality. To skip this, pass
  +`--disable-wallet` to `./configure` and skip to the next section.
  +
  +```shell
  +./contrib/install_db4.sh `pwd`
  +export BDB_PREFIX="$PWD/db4"
  ```
  ## Building Bitcoin Core
  **Important**: Use `gmake` (the non-GNU `make` will exit with an error):
  -```
  +With wallet:
  +```shell
  ./autogen.sh
  -
  -./configure # to build with wallet OR
  -./configure --disable-wallet # to build without wallet
  +./configure --with-gui=no \
  + BDB_LIBS="-L${BDB_PREFIX}/lib -ldb_cxx-4.8" \
  + BDB_CFLAGS="-I${BDB_PREFIX}/include"
  ```
  -followed by either:
  -
  -```
  -gmake
  +Without wallet:
  +```shell
  +./autogen.sh
  +./configure --with-gui=no --disable-wallet
  ```
  -to build without testing, or
  +followed by:
  +```shell
  +gmake # use -jX here for parallelism
  +gmake check # Run tests if Python 3 is available
  ```
  -gmake check
  -```
  -
  -to also run the test suite (recommended, if Python 3 is installed).
  -
  -*Note on debugging*: The version of `gdb` installed by default is [ancient and considered harmful](https://wiki.freebsd.org/GdbRetirement).
  -It is not suitable for debugging a multi-threaded C++ program, not even for getting backtraces. Please install the package `gdb` and
  -use the versioned gdb command (e.g. `gdb7111`).
  -
  