(AC_SYS_LARGEFILE_FLAGS, AC_SYS_LARGEFILE_SPACE_APPEND): Remove. (AC_SYS_LARGEFILE_TEST_INCLUDES): New macro. (AC_SYS_LARGEFILE_MACRO_VALUE): Change arguments from CODE-TO-SET-DEFAULT to VALUE, INCLUDES, FUNCTION-BODY. All uses changed. Instead of inspecting the output of getconf, try to compile the test program without and with the macro definition. (AC_SYS_LARGEFILE): Do not require AC_CANONICAL_HOST or check for getconf. Instead, check for the needed flags by compiling test programs.