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diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 673017f0..28704461 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -528,18 +528,20 @@ foreach(dir ${LIBDIRS})
endforeach(dir)
# install libflatarray, too
-file(GLOB HEADERS "${CMAKE_CURRENT_SOURCE_DIR}/../lib/libflatarray/src/*.hpp")
-foreach(i ${HEADERS})
- install(FILES ${i} DESTINATION include/libflatarray)
-endforeach()
-file(GLOB HEADERS "${CMAKE_CURRENT_SOURCE_DIR}/../lib/libflatarray/src/detail/*.hpp")
-foreach(i ${HEADERS})
- install(FILES ${i} DESTINATION include/libflatarray/detail)
-endforeach()
-file(GLOB HEADERS "${CMAKE_CURRENT_SOURCE_DIR}/../lib/libflatarray/src/testbed/*.hpp")
-foreach(i ${HEADERS})
- install(FILES ${i} DESTINATION include/libflatarray/testbed)
-endforeach()
+if(NOT libflatarray_FOUND)
+ file(GLOB HEADERS "${CMAKE_CURRENT_SOURCE_DIR}/../lib/libflatarray/src/*.hpp")
+ foreach(i ${HEADERS})
+ install(FILES ${i} DESTINATION include/libflatarray)
+ endforeach()
+ file(GLOB HEADERS "${CMAKE_CURRENT_SOURCE_DIR}/../lib/libflatarray/src/detail/*.hpp")
+ foreach(i ${HEADERS})
+ install(FILES ${i} DESTINATION include/libflatarray/detail)
+ endforeach()
+ file(GLOB HEADERS "${CMAKE_CURRENT_SOURCE_DIR}/../lib/libflatarray/src/testbed/*.hpp")
+ foreach(i ${HEADERS})
+ install(FILES ${i} DESTINATION include/libflatarray/testbed)
+ endforeach()
+endif()
# link against the libs we need
set(INSTALLER_LINK_FLAGS "-L${CMAKE_INSTALL_PREFIX}/${LIB_DIR} -Wl,-rpath,${CMAKE_INSTALL_PREFIX}/${LIB_DIR} -lgeodecomp ")
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