build, wallet, doc: Remove BDB

doc/build-freebsd.md

@@ -34,33 +34,6 @@ Skip if you don't intend to use descriptor wallets.
 pkg install sqlite3
 ```
 
-###### Legacy Wallet Support
-BerkeleyDB is only required if legacy wallet support is required.
-
-It is required to use Berkeley DB 4.8. You **cannot** use the BerkeleyDB library
-from ports. However, you can build DB 4.8 yourself [using depends](/depends).
-
-```bash
-pkg install gmake
-gmake -C depends NO_BOOST=1 NO_LIBEVENT=1 NO_QT=1 NO_ZMQ=1 NO_USDT=1
-```
-
-When the build is complete, the Berkeley DB installation location will be displayed:
-
-```
-to: /path/to/bitcoin/depends/x86_64-unknown-freebsd[release-number]
-```
-
-Finally, set `BDB_PREFIX` to this path according to your shell:
-
-```
-csh: setenv BDB_PREFIX [path displayed above]
-```
-
-```
-sh/bash: export BDB_PREFIX=[path displayed above]
-```
-
 #### GUI Dependencies
 ###### Qt6
 
@@ -107,20 +80,13 @@ pkg install python3 databases/py-sqlite3 net/py-pyzmq
 There are many ways to configure Bitcoin Core, here are a few common examples:
 
 ##### Descriptor Wallet and GUI:
-This disables legacy wallet support and enables the GUI, assuming `sqlite` and `qt` are installed.
+This enables the GUI, assuming `sqlite` and `qt` are installed.
 ```bash
-cmake -B build -DWITH_BDB=OFF -DBUILD_GUI=ON
+cmake -B build -DBUILD_GUI=ON
 ```
 
 Run `cmake -B build -LH` to see the full list of available options.
 
-##### Descriptor & Legacy Wallet. No GUI:
-This enables support for both wallet types, assuming
-`sqlite3` and `db4` are both installed.
-```bash
-cmake -B build -DBerkeleyDB_INCLUDE_DIR:PATH="${BDB_PREFIX}/include" -DWITH_BDB=ON
-```
-
 ##### No Wallet or GUI
 ```bash
 cmake -B build -DENABLE_WALLET=OFF