-- replace broken installation code with a clean one

--- python/CMakeLists.txt.orig	2025-12-03 16:37:32 UTC
+++ python/CMakeLists.txt
@@ -12,49 +12,21 @@ add_subdirectory(src/chemicalfun)
 
 #set(CHEMICALFUN_PYTHON_MODULE_FILENAME PyChemicalFun${PYTHON_MODULE_EXTENSION})
 
-# Install where the python package is installed to CMAKE_INSTALL_PREFIX if not given
-if(NOT DEFINED CHEMICALFUN_PYTHON_INSTALL_PREFIX)
 
-# Install the ChemicalFun python package using setuptools
-install(CODE
-"
-   if(${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC)
-      execute_process(
-        COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_FILE:PyChemicalFun>
-                ${CMAKE_CURRENT_BINARY_DIR}/src/chemicalfun/$<TARGET_FILE_NAME:PyChemicalFun>
-      )
-   endif()
+# In your CMakeLists.txt (Remove the execute_process(pip) lines completely)
 
-   execute_process(
-        COMMAND ${Python3_EXECUTABLE} -m pip install ${CMAKE_CURRENT_BINARY_DIR}
-        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-"
-)
+if(NOT DEFINED CHEMICALFUN_PYTHON_INSTALL_PREFIX)
+    set(CHEMICALFUN_PYTHON_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
+endif()
 
-else()
-
-# If the path is already in Windows format (with backslashes), it can't be added directly
-# to the string below, otherwise CMake will later complain about "Invalid escape sequence".
-file(TO_CMAKE_PATH "${CHEMICALFUN_PYTHON_INSTALL_PREFIX}" CHEMICALFUN_PYTHON_INSTALL_PREFIX)
-message(STATUS "CHEMICALFUN_PYTHON_INSTALL_PREFIX: ${CHEMICALFUN_PYTHON_INSTALL_PREFIX}")
-
-# Install the ChemicalFun python package using setuptools
-install(CODE
-"
-   file(TO_NATIVE_PATH \"${CHEMICALFUN_PYTHON_INSTALL_PREFIX}\" CHEMICALFUN_PYTHON_INSTALL_PREFIX_NATIVE)
-
-   if(${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC)
-      execute_process(
-        COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_FILE:PyChemicalFun>
-                ${CMAKE_CURRENT_BINARY_DIR}/src/chemicalfun/$<TARGET_FILE_NAME:PyChemicalFun>
-        )
-    endif()
-
-    execute_process(
-        COMMAND ${Python3_EXECUTABLE} -m pip install --prefix \${CHEMICALFUN_PYTHON_INSTALL_PREFIX_NATIVE} ${CMAKE_CURRENT_BINARY_DIR}
-        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-"
+# Just install the shared object library built by pybind11 natively
+install(TARGETS PyChemicalFun
+    DESTINATION "${CHEMICALFUN_PYTHON_INSTALL_PREFIX}/lib/python${Python3_VERSION_MAJOR}.${Python3_VERSION_MINOR}/site-packages/chemicalfun"
 )
 
-endif()
+# Install the Python source wrapper files natively 
+install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/src/chemicalfun/
+        DESTINATION "${CHEMICALFUN_PYTHON_INSTALL_PREFIX}/lib/python${Python3_VERSION_MAJOR}.${Python3_VERSION_MINOR}/site-packages/chemicalfun"
+        FILES_MATCHING PATTERN "*.py"
+)