DARWIN_OS Compiling on Mac OS X or pure Darwin (and using s/darwin.h).
SOLARIS2
USG
-USG5
USG5_4
** Distinguishing GUIs **
BROKEN_GET_CURRENT_DIR_NAME
BROKEN_NON_BLOCKING_CONNECT
BROKEN_PTY_READ_AFTER_EAGAIN
-CLASH_DETECTION
-DATA_SEG_BITS
DEFAULT_SOUND_DEVICE
DEVICE_SEP
DIRECTORY_SEP
HAVE_DECL_SYS_SIGLIST
HAVE_DECL_TZNAME
HAVE_DECL___SYS_SIGLIST
-HAVE_DES_H
-HAVE_DEV_PTMX
HAVE_DIALOGS
HAVE_DIFFTIME
HAVE_DUP2
HAVE_GHOSTSCRIPT
HAVE_GIF
HAVE_GNUTLS
-HAVE_GNUTLS_CALLBACK_CERTIFICATE_VERIFY
-HAVE_GNUTLS_CERTIFICATE_SET_VERIFY_FUNCTION
HAVE_GPM
HAVE_GRANTPT
HAVE_GSETTINGS
HAVE_INET_SOCKETS
HAVE_INTTYPES_H
HAVE_JPEG
-HAVE_KERBEROSIV_DES_H
HAVE_KERBEROSIV_KRB_H
-HAVE_KERBEROS_DES_H
HAVE_KERBEROS_KRB_H
HAVE_KRB5_ERROR_E_TEXT
HAVE_KRB5_ERROR_TEXT
HAVE_KRB5_H
HAVE_KRB_H
HAVE_LANGINFO_CODESET
-HAVE_LIBCOM_ERR
-HAVE_LIBCRYPTO
-HAVE_LIBDES
-HAVE_LIBDES425
HAVE_LIBDGC
-HAVE_LIBDNET
-HAVE_LIBHESIOD
-HAVE_LIBK5CRYPTO
-HAVE_LIBKRB
-HAVE_LIBKRB4
-HAVE_LIBKRB5
HAVE_LIBKSTAT
HAVE_LIBLOCKFILE
-HAVE_LIBM
HAVE_LIBMAIL
HAVE_LIBOTF
HAVE_LIBPERFSTAT
HAVE_LIBPNG_PNG_H
-HAVE_LIBPTHREADS
-HAVE_LIBRESOLV
HAVE_LIBSELINUX
-HAVE_LIBXEXT
HAVE_LIBXML2
HAVE_LIBXMU
-HAVE_LINUX_VERSION_H
HAVE_LOCALTIME_R
HAVE_LOCAL_SOCKETS
HAVE_LONG_FILE_NAMES
HAVE_SOCKETS
HAVE_SOUND
HAVE_SOUNDCARD_H
-HAVE_SPEED_T
HAVE_STDINT_H
HAVE_STDIO_EXT_H
HAVE_STDLIB_H