USE_LISP_UNION_TYPE Define it in lisp.h to make Lisp_Object be a union type instead of the default int.
** System specific macros, decribed in detail in src/s/template.h
-BSTRING
CLASH_DETECTION
COFF
FIRST_PTY_LETTER
SEPCHAR
SIGTYPE
SYSTEM_TYPE
-USE_MMAP_FOR_BUFFERS
** Machine specific macros, decribed in detail in src/m/template.h
-CANNOT_DUMP
EXPLICIT_SIGN_EXTEND
LOAD_AVE_CVT
LOAD_AVE_TYPE
AIX
AMPERSAND_FULL_NAME
-BCOPY_DOWNWARD_SAFE
-BCOPY_UPWARD_SAFE
BITS_PER_EMACS_INT
BITS_PER_LONG
BITS_PER_CHAR
FILE_SYSTEM_CASE
FLOAT_CHECK_DOMAIN
FSCALE
-GAP_USE_BCOPY
GC_LISP_OBJECT_ALIGNMENT
GC_MARK_SECONDARY_STACK
GC_MARK_STACK
GNU_LINUX
GNU_MALLOC
HAVE_AIX_SMT_EXP
-HAVE_BCMP
-HAVE_BCOPY
HAVE_CBRT
HAVE_CLOSEDIR
HAVE_DUP2
HAVE_WORKING_VFORK
HAVE_XRMSETDATABASE
HPUX
-INHIBIT_X11R6_XIM
INTERNAL_TERMINAL
IS_ANY_SEP
IS_DIRECTORY_SEP
abort
access
alloca
-bcmp
-bcopy
brk
-bzero
calloc
chdir
chmod