diff -r 5ce902458048 -r 99debf19e3ce base/xrdb/build.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/xrdb/build.sh	Fri Jul 24 09:16:18 2026 -0500
@@ -0,0 +1,29 @@
+#!/bin/sh
+# Build script for xrdb (autotools, Template A + runtime cpp pin).
+set -e
+cd "$SRCDIR"
+
+# MANDATORY libtool fix (Task 4a, 2026-07-22): see libXau/build.sh for the
+# full explanation. Piggyback hammerhead onto the kopensolaris arm.
+if [ -f configure ]; then
+    sed -i -E 's/(kopensolaris\*-gnu)([^)]*\))/\1 | hammerhead*\2/' configure
+fi
+
+export PKG_CONFIG_PATH="$PREFIX/lib/pkgconfig:$PREFIX/share/pkgconfig:/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH"
+export CFLAGS="${CFLAGS} -I$PREFIX/include -D__EXTENSIONS__ -D_POSIX_PTHREAD_SEMANTICS"
+export LDFLAGS="${LDFLAGS} -L$PREFIX/lib -R$PREFIX/lib"
+
+# xrdb pipes resource files through cpp at RUNTIME, not just build time.
+# configure's AC_PATH_PROG probe would find Hammerhead's /usr/bin/cpp via
+# PATH anyway, but pin it explicitly so the result doesn't depend on PATH
+# search order across build hosts.
+./configure \
+    --prefix="$PREFIX" \
+    --build="$BUILD_TRIPLE" \
+    --host="$BUILD_TRIPLE" \
+    --sysconfdir="$SYSCONFDIR" \
+    --disable-static \
+    --with-cpp=/usr/bin/cpp
+
+gmake -j${JOBS:-1}
+gmake install DESTDIR="$PKGDIR"
diff -r 5ce902458048 -r 99debf19e3ce base/xrdb/package.toml
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/xrdb/package.toml	Fri Jul 24 09:16:18 2026 -0500
@@ -0,0 +1,36 @@
+# xrdb - X server resource database utility
+# https://gitlab.freedesktop.org/xorg/app/xrdb
+#
+# hammerhead-xdm's Xsession/greeter uses xrdb to load
+# /usr/local/lib/X11/xdm/Xresources onto the X server's RESOURCE_MANAGER so
+# the xlogin greeter picks up the Zygaena teal branding + greeting instead of
+# the default white box. See docs/roadmap/DESKTOP_XLIBRE_XDM_GREETER_PLAN.md.
+#
+# xrdb pipes resource files through a C preprocessor at RUNTIME (not just
+# build time). configure's AC_PATH_PROG cpp probe searches
+# $PATH:/bin:/usr/bin:/usr/lib:/usr/libexec:/usr/ccs/lib:/usr/ccs/lbin:/lib,
+# which would find Hammerhead's /usr/bin/cpp anyway, but build.sh pins
+# --with-cpp=/usr/bin/cpp explicitly for a deterministic, host-independent
+# result rather than relying on PATH search order.
+
+[package]
+name = "xrdb"
+version = "1.2.3"
+release = 1
+description = "X server resource database utility (xdm greeter branding)"
+url = "https://xorg.freedesktop.org/releases/individual/app/"
+license = "MIT"
+maintainer = "Chris Tusa <chris.tusa@leafscale.com>"
+arch = "x86_64"
+
+[dependencies]
+runtime = ["libX11", "libXmu"]
+build = ["libX11", "libXmu", "xorgproto", "util-macros"]
+
+[[source]]
+file = "xrdb-1.2.3.tar.xz"
+urls = ["https://xorg.freedesktop.org/releases/individual/app/xrdb-1.2.3.tar.xz"]
+checksum = "c88f560243278c896ce4fc92ae5a45a2b505a316ffa427fe55b02e5d5914c4e4"
+
+[build]
+parallel = true