Document repeatable wallet builds

doc/build-ubuntu-24.md

@@ -1,10 +1,10 @@
 Copyright (c) 2026 Agrarian Developers
 
-Ubuntu 24.04 Daemon Build Notes
-================================
+Ubuntu 24.04 Build Notes
+========================
 
-These notes describe the native daemon build path tested against current Ubuntu
-24.04 system packages.
+These notes describe the native daemon and desktop wallet build paths tested
+against current Ubuntu 24.04 system packages.
 
 Recommended host size
 ---------------------
@@ -16,7 +16,7 @@ building large translation units.
 Packages
 --------
 
-Install the native build dependencies:
+Install the native daemon build dependencies:
 
     sudo apt-get update
     sudo apt-get install -y \
@@ -24,6 +24,12 @@ Install the native build dependencies:
       libboost-all-dev libevent-dev libgmp-dev libssl-dev \
       libdb5.3-dev libdb5.3++-dev
 
+For the desktop wallet, also install Qt and protobuf tools:
+
+    sudo apt-get install -y \
+      qtbase5-dev qttools5-dev-tools qtchooser \
+      libqrencode-dev libprotobuf-dev protobuf-compiler
+
 Daemon-only build
 -----------------
 
@@ -40,6 +46,35 @@ For the pool daemon, the GUI, tests, bench, ZMQ, and UPnP can be disabled:
       CXXFLAGS="-O0 -g0 --param ggc-min-expand=1 --param ggc-min-heapsize=32768"
     make -j1
 
+The daemon helper runs the same path:
+
+    JOBS=1 ./contrib/build-linux.sh
+
+Qt wallet build
+---------------
+
+For the desktop wallet, use:
+
+    JOBS=1 ./contrib/build-linux-wallet.sh
+
+The wallet helper builds/restores the native depends prefix first, then creates
+a temporary config.site that keeps the depends libraries while allowing system
+Qt 5 tools and pkg-config files to be used.
+
+Defaults:
+
+    HOST=x86_64-pc-linux-gnu
+    QT_BINDIR=/usr/lib/qt5/bin
+    PROTOC_BINDIR=/usr/bin
+    CONFIG_SITE_FILE=/tmp/agrarian-linux-wallet-config.site
+
+Warnings
+--------
+
+Qt 5.15 and protobuf 3.x emit compatibility/deprecation warnings in a few Qt
+translation units. Those warnings are expected while the Windows build remains
+pinned to Qt 5.9.7 and protobuf 2.6.1.
+
 OpenSSL 3
 ---------