File cadabra2-python-modules-location.patch of Package cadabra2

Index: cadabra2-2.3.0/CMakeLists.txt
===================================================================
--- cadabra2-2.3.0.orig/CMakeLists.txt
+++ cadabra2-2.3.0/CMakeLists.txt
@@ -231,6 +231,9 @@ endif()
 
 print_header("Configuring Python")
 
+# NEEDED TO USE CMAKE_INSTALL_FULL<dir>
+include(GNUInstallDirs)
+
 if(USE_PYTHON_3)
 	set(PYTHON_POSTFIX "3")
 	message(STATUS "Building for use with Python 3 (good!)")
@@ -243,9 +246,17 @@ add_subdirectory(libs/pybind11)
 
 message(STATUS "Found python ${PYTHON_LIBRARIES}")
 
-# We install the python module in our 'share' path, not in
-# the site-wide path as we used to. 
-set(PYTHON_SITE_PATH share/cadabra2/python)
+if(${CMAKE_VERSION} VERSION_LESS 3.12.0)
+	find_package(PythonInterp)
+	set(PYTHON_SITE_PATH ${CMAKE_INSTALL_FULL_LIBDIR}/python${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}/site-packages)
+else()
+	find_package (Python COMPONENTS Interpreter)
+	set(PYTHON_SITE_PATH ${CMAKE_INSTALL_FULL_LIBDIR}/python${Python_VERSION_MAJOR}.${Python_VERSION_MINOR}/site-packages)
+endif()
+
+string(REGEX REPLACE "^${CMAKE_INSTALL_PREFIX}" "" PYTHON_SITE_PATH_REL ${PYTHON_SITE_PATH})
+set(PYTHON_SITE_PATH_REL ${PYTHON_SITE_PATH_REL})
+
 if(NOT WIN32)
   execute_process(
 	 COMMAND ${PYTHON_EXECUTABLE} -c "import site; print (site.getsitepackages()[0]);"
Index: cadabra2-2.3.0/core/cadabra2.in
===================================================================
--- cadabra2-2.3.0.orig/core/cadabra2.in
+++ cadabra2-2.3.0/core/cadabra2.in
@@ -19,10 +19,9 @@ import rlcompleter
 import os
 
 # Make sure we can find the cadabra2 python module; is always
-# installed in ../share/cadabra2/python relative to the location
-# of the 'cadabra2' script.
+# installed in PYTHON_SITE_PATH
 install_prefix=os.path.realpath(sys.argv[0])
-install_prefix=install_prefix.replace(os.sep+'bin'+os.sep+'cadabra2', os.sep+'share'+os.sep+'cadabra2'+os.sep+'python')
+install_prefix=install_prefix.replace(os.sep+'bin'+os.sep+'cadabra2', '${PYTHON_SITE_PATH_REL}')
 # print("Module path ", install_prefix)
 sys.path.append(install_prefix)
 
@@ -256,5 +255,5 @@ if __name__ == '__main__':
                 # pulling in the right locals/globals
                 #            sh.interact(banner='Info at http://cadabra.phi-sci.com/\nAvailable under the terms of the GNU General Public License v3\n', locals(), globals())
     else:
-        sh.runsource("import os; import sys; install_prefix=os.path.realpath(sys.argv[0]); install_prefix=install_prefix.replace('/bin/cadabra2','/share/cadabra2/python'); sys.path.append(install_prefix); print('Cadabra @CADABRA_VERSION_MAJOR@.@CADABRA_VERSION_MINOR@.@CADABRA_VERSION_PATCH@ (build @CADABRA_VERSION_BUILD@ dated @CADABRA_VERSION_DATE@)'); print ('Copyright (C) @COPYRIGHT_YEARS@  Kasper Peeters <kasper.peeters@phi-sci.com>'); f=open('${CMAKE_INSTALL_PREFIX}/${PYTHON_SITE_PATH}/cadabra2_defaults.py'); code=compile(f.read(), 'cadabra2_defaults.py', 'exec'); exec(code); f.close(); print('Using SymPy version '+sympy.__version__);")
+        sh.runsource("import os; import sys; install_prefix=os.path.realpath(sys.argv[0]); install_prefix=install_prefix.replace('/bin/cadabra2','${PYTHON_SITE_PATH_REL}'); sys.path.append(install_prefix); print('Cadabra @CADABRA_VERSION_MAJOR@.@CADABRA_VERSION_MINOR@.@CADABRA_VERSION_PATCH@ (build @CADABRA_VERSION_BUILD@ dated @CADABRA_VERSION_DATE@)'); print ('Copyright (C) @COPYRIGHT_YEARS@  Kasper Peeters <kasper.peeters@phi-sci.com>'); f=open('${PYTHON_SITE_PATH}/cadabra2_defaults.py'); code=compile(f.read(), 'cadabra2_defaults.py', 'exec'); exec(code); f.close(); print('Using SymPy version '+sympy.__version__);")
         sh.interact(banner='Info at http://cadabra.science/\nAvailable under the terms of the GNU General Public License v3\n')
Index: cadabra2-2.3.0/core/cadabra2-cli.cc
===================================================================
--- cadabra2-2.3.0.orig/core/cadabra2-cli.cc
+++ cadabra2-2.3.0/core/cadabra2-cli.cc
@@ -113,7 +113,7 @@ void Shell::restart()
 	}
 
 	sys = PyImport_ImportModule("sys");
-	std::string module_path = cadabra::install_prefix() + "/share/cadabra2/python";
+	std::string module_path = PYTHON_SITE_PATH;
 	PyObject* module_path_str = PyUnicode_FromString(module_path.c_str());
 	PyList_Append(PyObject_GetAttrString(sys, "path"), module_path_str);
 	Py_XDECREF(module_path_str);
@@ -122,7 +122,7 @@ void Shell::restart()
 void Shell::interact()
 {
 	// Run cadabra2_defaults.py
-	if (!execute_file(cadabra::install_prefix() + "/share/cadabra2/python/cadabra2_defaults.py", false)) {
+	if (!execute_file(std::string(PYTHON_SITE_PATH) + "/cadabra2_defaults.py", false)) {
 		handle_error();
 		throw ExitRequest("Error encountered while initializing the interpreter");
 	}
Index: cadabra2-2.3.0/core/Config.hh.in
===================================================================
--- cadabra2-2.3.0.orig/core/Config.hh.in
+++ cadabra2-2.3.0/core/Config.hh.in
@@ -21,3 +21,4 @@
 #define Mathematica_KERNEL_EXECUTABLE "@Mathematica_KERNEL_EXECUTABLE@"
 
 #define PYTHON_SITE_PATH      "@PYTHON_SITE_PATH@"
+#define PYTHON_SITE_PATH_REL  "@PYTHON_SITE_PATH_REL@"
Index: cadabra2-2.3.0/client_server/Server.cc
===================================================================
--- cadabra2-2.3.0.orig/client_server/Server.cc
+++ cadabra2-2.3.0/client_server/Server.cc
@@ -106,7 +106,7 @@ void Server::init()
 
 	// Make the C++ CatchOutput class visible on the Python side.
 
-	auto python_path = cadabra::install_prefix()+"/share/cadabra2/python";
+	auto python_path = std::string(PYTHON_SITE_PATH);
 
 	std::string stdOutErr =
 	   "import sys\n"