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diff --git a/cmake/cxxopts.cmake b/cmake/cxxopts.cmake
index 46e87ba..0ead543 100644
--- a/cmake/cxxopts.cmake
+++ b/cmake/cxxopts.cmake
@@ -87,7 +87,12 @@ endfunction()
# Helper function to ecapsulate install logic
function(cxxopts_install_logic)
- string(REPLACE "/${CMAKE_LIBRARY_ARCHITECTURE}" "" CMAKE_INSTALL_LIBDIR_ARCHIND "${CMAKE_INSTALL_LIBDIR}")
+ if(CMAKE_LIBRARY_ARCHITECTURE)
+ string(REPLACE "/${CMAKE_LIBRARY_ARCHITECTURE}" "" CMAKE_INSTALL_LIBDIR_ARCHIND "${CMAKE_INSTALL_LIBDIR}")
+ else()
+ # On some systems (e.g. NixOS), `CMAKE_LIBRARY_ARCHITECTURE` can be empty
+ set(CMAKE_INSTALL_LIBDIR_ARCHIND "${CMAKE_INSTALL_LIBDIR}")
+ endif()
set(CXXOPTS_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR_ARCHIND}/cmake/cxxopts" CACHE STRING "Installation directory for cmake files, relative to ${CMAKE_INSTALL_PREFIX}.")
set(version_config "${PROJECT_BINARY_DIR}/cxxopts-config-version.cmake")
set(project_config "${PROJECT_BINARY_DIR}/cxxopts-config.cmake")
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