diff --git a/CMakeLists.txt b/CMakeLists.txt
index f6bd3f14305..f572d254a76 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -876,6 +876,13 @@ function(orcaslicer_copy_dlls target config postfix output_dlls)
 endfunction()
 
 
+# Ensure Eigen3::Eigen IMPORTED target exists before deps_src subdirectories
+# are configured. In static builds find_package(Eigen3) is skipped above, so
+# admesh/clipper (which link Eigen3::Eigen) would fail without this call.
+if(NOT TARGET Eigen3::Eigen)
+    find_package(Eigen3 CONFIG QUIET)
+endif()
+
 # libslic3r, OrcaSlicer GUI and the OrcaSlicer executable.
 add_subdirectory(deps_src)
 add_subdirectory(src)
diff --git a/deps_src/eigen/CMakeLists.txt b/deps_src/eigen/CMakeLists.txt
index c0cb27d3ae2..9bc9a7c52a6 100644
--- a/deps_src/eigen/CMakeLists.txt
+++ b/deps_src/eigen/CMakeLists.txt
@@ -1,36 +1,13 @@
 cmake_minimum_required(VERSION 3.13)
 project(eigen)
 
-# Try to find the pre-built Eigen3 installed by deps/ CMakeLists (Eigen 5.x).
-# This must succeed: libigl and admesh use Eigen 3.4+ features (e.g. Eigen::all).
-find_package(Eigen3 CONFIG QUIET)
-
-if(Eigen3_FOUND OR TARGET Eigen3::Eigen)
-    message(STATUS "deps_src/eigen: using pre-built Eigen3 from CMAKE_PREFIX_PATH")
-else()
-    # Fall back: construct the include path from the known deps install location.
-    # CMAKE_PREFIX_PATH points to deps/build/OrcaSlicer_dep/usr/local;
-    # Eigen installs its headers under <prefix>/include/eigen3.
-    set(_eigen_include "")
-    foreach(_prefix ${CMAKE_PREFIX_PATH})
-        if(EXISTS "${_prefix}/include/eigen3")
-            set(_eigen_include "${_prefix}/include/eigen3")
-            break()
-        endif()
-    endforeach()
-
-    if(_eigen_include)
-        message(STATUS "deps_src/eigen: using eigen3 headers from ${_eigen_include}")
-        add_library(Eigen3::Eigen INTERFACE IMPORTED GLOBAL)
-        set_target_properties(Eigen3::Eigen PROPERTIES
-            INTERFACE_INCLUDE_DIRECTORIES "${_eigen_include}")
-    else()
-        message(FATAL_ERROR "deps_src/eigen: could not locate Eigen3 headers. "
-            "Ensure deps/ has been built first (cmake --build deps/build).")
-    endif()
+# Eigen3::Eigen is resolved in the parent CMakeLists before add_subdirectory(deps_src)
+# via find_package(Eigen3 CONFIG). This file only creates the unnamespaced "eigen" alias.
+if(NOT TARGET Eigen3::Eigen)
+    message(FATAL_ERROR "Eigen3::Eigen target not found. "
+        "Ensure find_package(Eigen3 CONFIG) is called before add_subdirectory(deps_src).")
 endif()
 
-# Provide unnamespaced "eigen" alias for targets that link against it directly.
 if(NOT TARGET eigen)
     add_library(eigen INTERFACE)
     target_link_libraries(eigen INTERFACE Eigen3::Eigen)