target_include_directories(<target> [SYSTEM] [AFTER|BEFORE] <INTERFACE|PUBLIC|PRIVATE> [items1...] [<INTERFACE|PUBLIC|PRIVATE> [items2...] ...])
target_include_directories(<target> [SYSTEM] [AFTER|BEFORE] <INTERFACE|PUBLIC|PRIVATE> [items1...] [<INTERFACE|PUBLIC|PRIVATE> [items2...] ...])
target_include_directories ( SPEX_static SYSTEM AFTER PUBLIC ${MPFR_INCLUDE_DIR} )