Ensure that all generated files are placed into ${CMAKE_CURRENT_BINARY_DIR} rather than ${CMAKE_CURRENT_SOURCE_DIR}{}. The following files need to be moved:

• Files generated by prefixer:
  • include/ossl.h
  • include/ossl/*.h
  • source/ossl.c
• Files copied/patched by
  • target_add_bssl_source()
  • target_add_bssl_include()