0001-cmake-relocate-prefix.patch

--- a/arpack-ng-config.cmake.in
+++ b/arpack-ng-config.cmake.in
@@ -11,6 +11,15 @@
 #   add_executable(main main.f)
 #   target_link_libraries(main PARPACK::PARPACK)
 
+# Compute the installation prefix relative to this file.
+get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
+get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+if(_IMPORT_PREFIX STREQUAL "/")
+  set(_IMPORT_PREFIX "")
+endif()
+
 # Create local variables.
 set(prefix "@prefix@")
 set(exec_prefix "@exec_prefix@")