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diff --git a/elite-robots-msgs.spec b/elite-robots-msgs.spec
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+# topdir: elite-robots-msgs-1.0.3 (created by --transform)
+# subpkg: elite_robots_msgs (ROS2 ament_cmake package within multi-package repo)
+%define ros_distro humble
+%define RosPkgName elite-robots-msgs
+
+Name:           elite-robots-msgs
+Version:        1.0.3
+Release:        1%{?dist}
+Summary:        Message and service definitions for Elite Robots robot controllers
+
+License:        Apache-2.0
+URL:            https://github.com/EliteRobots/Elite_Robots_CS_ROS2_Driver
+# Use #/ suffix to force rpm filename; archive contains multi-package repo
+Source0:        https://github.com/EliteRobots/Elite_Robots_CS_ROS2_Driver/archive/ce37530dd197d1ff4669b193f50803acd9622461.tar.gz#/elite-robots-msgs-1.0.3.tar.gz
+
+# ROS packages install to /opt/ros — debug/strip not meaningful
+%global debug_package %{nil}
+# /opt python bytecode compilation writes to standard sitelib — remove brp hook
+%global __os_install_post %(echo '%{__os_install_post}' | sed -e 's!/usr/lib[^[:space:]]*/brp-python-bytecompile[[:space:]].*$!!g')
+# ROS .so under /opt/ros — exclude from autodeps scanning
+%global __provides_exclude_from ^/opt/ros/%{ros_distro}/.*$
+%global __requires_exclude_from ^/opt/ros/%{ros_distro}/.*$
+
+BuildRequires:  ros-%{ros_distro}-ament-cmake
+BuildRequires:  ros-%{ros_distro}-rosidl-default-generators
+BuildRequires:  ros-%{ros_distro}-geometry-msgs
+BuildRequires:  cmake
+BuildRequires:  gcc-c++
+BuildRequires:  python3-devel
+
+Requires:       ros-%{ros_distro}-rosidl-default-runtime
+Requires:       ros-%{ros_distro}-ros-workspace
+Requires:       ros-%{ros_distro}-ament-cmake
+
+Provides:       ros-%{ros_distro}-%{RosPkgName} = %{version}-%{release}
+
+%description
+Message and service definitions for interacting with Elite Robots robot
+controllers. This package provides ROS2 interface definitions (.msg and
+.srv files) for the Elite Robots CS series driver.
+
+%prep
+%autosetup -n %{name}-%{version}
+
+%build
+# ROS base environment (guard against missing setup.sh in buildroot)
+[ -f /opt/ros/%{ros_distro}/setup.sh ] && source /opt/ros/%{ros_distro}/setup.sh || true
+export PYTHONPATH=/opt/ros/%{ros_distro}/lib/python%{python3_version}/site-packages${PYTHONPATH:+:$PYTHONPATH}
+export PKG_CONFIG_PATH=/opt/ros/%{ros_distro}/lib/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+
+# Build from the elite_robots_msgs subdirectory (multi-package repo)
+cd elite_robots_msgs
+mkdir -p .obj && cd .obj
+cmake .. \
+  -DCMAKE_INSTALL_PREFIX="/opt/ros/%{ros_distro}" \
+  -DAMENT_PREFIX_PATH="/opt/ros/%{ros_distro}" \
+  -DCMAKE_PREFIX_PATH="/opt/ros/%{ros_distro}" \
+  -UINCLUDE_INSTALL_DIR -ULIB_INSTALL_DIR -USYSCONF_INSTALL_DIR \
+  -USHARE_INSTALL_PREFIX -ULIB_SUFFIX \
+  -DSETUPTOOLS_DEB_LAYOUT=OFF \
+  -DBUILD_TESTING=OFF \
+  -DCMAKE_BUILD_TYPE=Release
+make %{?_smp_mflags}
+
+%install
+# ROS base environment
+[ -f /opt/ros/%{ros_distro}/setup.sh ] && source /opt/ros/%{ros_distro}/setup.sh || true
+export PYTHONPATH=/opt/ros/%{ros_distro}/lib/python%{python3_version}/site-packages${PYTHONPATH:+:$PYTHONPATH}
+export PKG_CONFIG_PATH=/opt/ros/%{ros_distro}/lib/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+
+cd elite_robots_msgs/.obj
+make install DESTDIR=%{buildroot}
+
+%files
+/opt/ros/%{ros_distro}
+
+%changelog
+* Fri Oct 09 2026 AI Importer <ai@openeuler.org> - 1.0.3-1
+- Initial package for Elite Robots ROS2 message definitions