Include sqlite3 in documentation

doc/build-unix.md

@@ -46,6 +46,7 @@ Optional dependencies:
  libqrencode | QR codes in GUI  | Optional for generating QR codes (only needed when GUI enabled)
  univalue    | Utility          | JSON parsing and encoding (bundled version will be used unless --with-system-univalue passed to configure)
  libzmq3     | ZMQ notification | Optional, allows generating ZMQ notifications (requires ZMQ version >= 4.0.0)
+ sqlite3     | SQLite DB       | Wallet storage (only needed when wallet enabled)
 
 For the versions used, see [dependencies.md](dependencies.md)
 
@@ -91,6 +92,10 @@ pass `--with-incompatible-bdb` to configure.
 
 Otherwise, you can build from self-compiled `depends` (see above).
 
+SQLite is required for the wallet:
+
+    sudo apt install libsqlite3-dev
+
 To build Bitcoin Core without wallet, see [*Disable-wallet mode*](/doc/build-unix.md#disable-wallet-mode)
 
 
@@ -144,6 +149,10 @@ libqrencode (optional) can be installed with:
 
     sudo dnf install qrencode-devel
 
+SQLite can be installed with:
+
+    sudo dnf install sqlite-devel
+
 Notes
 -----
 The release is built with GCC and then "strip bitcoind" to strip the debug
@@ -238,7 +247,7 @@ disable-wallet mode with:
 
     ./configure --disable-wallet
 
-In this case there is no dependency on Berkeley DB 4.8.
+In this case there is no dependency on Berkeley DB 4.8 and SQLite.
 
 Mining is also possible in disable-wallet mode using the `getblocktemplate` RPC call.