Document Ubuntu 24 daemon build

README.md

@@ -90,6 +90,8 @@ To see configuration options:
 ./configure --help
 ```
 
+For a current Ubuntu daemon build, see `doc/build-ubuntu-24.md`.
+
 ---
 
 ## Running Tests
@@ -114,4 +116,4 @@ Refer to scripts under `contrib/` for additional CI or functional test flows.
 
 ## License
 
-See the `COPYING` file for license details.
+See the `COPYING` file for license details.

configure.ac

@@ -1102,11 +1102,7 @@ AC_CHECK_DECLS([EVP_MD_CTX_new],,,[AC_INCLUDES_DEFAULT
 CXXFLAGS="${save_CXXFLAGS}"
 
 AC_CHECK_LIB([crypto],[RAND_egd],[],[
-  AC_ARG_WITH([unsupported-ssl],
-    [AS_HELP_STRING([--with-unsupported-ssl],[Build with system SSL (default is no; DANGEROUS; NOT SUPPORTED; You should use OpenSSL 1.0)])],
-    [AC_MSG_WARN([Detected unsupported SSL version: This is NOT supported, and may break consensus compatibility!])],
-    [AC_MSG_ERROR([Detected unsupported SSL version: This is NOT supported, and may break consensus compatibility!])]
-  )
+  AC_MSG_WARN([RAND_egd is unavailable in this OpenSSL version; continuing with the modern libcrypto RNG API])
 ])
 
 dnl univalue check

contrib/build-linux.sh

@@ -2,20 +2,20 @@
 set -euo pipefail
 
 ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
-HOST="x86_64-pc-linux-gnu"
-DEP="$ROOT/depends/$HOST"
+JOBS="${JOBS:-1}"
 
 cd "$ROOT"
 
-make -C depends -j"$(nproc)" NO_QT=1
-make -C depends NO_QT=1 install
-
 ./autogen.sh
 
-CONFIG_SITE="$DEP/share/config.site" \
-./configure --build="$HOST" --host="$HOST" \
-  --prefix="$DEP" \
-  --disable-tests --disable-bench
+./configure \
+  --without-gui \
+  --disable-tests \
+  --disable-bench \
+  --disable-zmq \
+  --with-miniupnpc=no \
+  --with-incompatible-bdb \
+  CXXFLAGS="${CXXFLAGS:--O0 -g0 --param ggc-min-expand=1 --param ggc-min-heapsize=32768}"
 
-make -j"$(nproc)"
+make -j"$JOBS"
 echo "Build complete."

doc/build-ubuntu-24.md

@@ -0,0 +1,56 @@
+Copyright (c) 2026 Agrarian Developers
+
+Ubuntu 24.04 Daemon Build Notes
+================================
+
+These notes describe the native daemon build path tested against current Ubuntu
+24.04 system packages.
+
+Recommended host size
+---------------------
+
+Use at least 2 GB RAM for a reliable build. A 512 MB host with 2 GB swap can
+configure successfully, but compilation is extremely slow and may time out while
+building large translation units.
+
+Packages
+--------
+
+Install the native build dependencies:
+
+    sudo apt-get update
+    sudo apt-get install -y \
+      build-essential pkg-config autoconf automake libtool bsdmainutils \
+      libboost-all-dev libevent-dev libgmp-dev libssl-dev \
+      libdb5.3-dev libdb5.3++-dev
+
+Daemon-only build
+-----------------
+
+For the pool daemon, the GUI, tests, bench, ZMQ, and UPnP can be disabled:
+
+    ./autogen.sh
+    ./configure \
+      --without-gui \
+      --disable-tests \
+      --disable-bench \
+      --disable-zmq \
+      --with-miniupnpc=no \
+      --with-incompatible-bdb \
+      CXXFLAGS="-O0 -g0 --param ggc-min-expand=1 --param ggc-min-heapsize=32768"
+    make -j1
+
+OpenSSL 3
+---------
+
+Ubuntu 24.04 ships OpenSSL 3. Agrarian no longer rejects this only because
+`RAND_egd` is unavailable. Some deprecated OpenSSL SHA calls still warn during
+compilation; those warnings are expected until the hashing helper code is
+modernized.
+
+Berkeley DB
+-----------
+
+Ubuntu 24.04 provides Berkeley DB 5.3. Wallet builds with BDB 5.3 are not
+portable back to BDB 4.8 wallet environments, so only use wallets created by this
+build with compatible BDB 5.3 builds.