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+This is a description of C preprocessor defines that readline accepts.
+Most are passed in from the parent `make'; e.g. from the bash source
+directory.
+
+NO_SYS_FILE <sys/file.h> is not present
+HAVE_UNISTD_H <unistd.h> exists
+HAVE_STDLIB_H <stdlib.h> exists
+HAVE_GETPW_DECLS declarations for the getpw functions are in <pwd.h>
+HAVE_VARARGS_H <varargs.h> exists and is usable
+HAVE_STRING_H <string.h> exists
+HAVE_ALLOCA_H <alloca.h> exists and is needed for alloca()
+HAVE_ALLOCA alloca(3) or a define for it exists
+PRAGMA_ALLOCA use of alloca() requires a #pragma, as in AIX 3.x
+VOID_SIGHANDLER signal handlers are void functions
+HAVE_DIRENT_H <dirent.h> exists and is usable
+HAVE_SYS_PTEM_H <sys/ptem.h> exists
+HAVE_SYS_PTE_H <sys/pte.h> exists
+HAVE_SYS_STREAM_H <sys/stream.h> exists
+
+System-specific options:
+
+OSF1 A machine running OSF/1
+BSD386 BSDI's BSD/386 version 1.0 or 1.1
+NetBSD NetBSD
+FreeBSD FreeBSD version 1.1
+_386BSD Old FreeBSD or NetBSD or ancient Jolitz 386bsd
+AIX AIX 3.x
+USG Running a variant of System V
+USGr3 Running System V.3
+XENIX_22 Xenix 2.2
+Linux Linux
+CRAY running a recent version of Cray UNICOS