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+Major changes in release 1.5:
+
+* New macro AC_FIND_X.
+* autoconf and autoheader scripts have GNU standards conforming
+  --version and --help options (they print their message and exit).
+* Many bug fixes.
+\f
+Major changes in release 1.4:
+
+* New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
+  AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
+* autoconf and autoheader use the M4 environment variable to determine the
+  path of the m4 program to use.
+* The --macrodir option to autoconf and autoheader specifies the directory
+  in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
+* autoconf and autoheader can take `-' as their file names, which means to
+  read stdin as input.
+* Resulting configure scripts can take a --verbose option which causes them
+  to print the results of their tests.
+* AC_DEFINE quotes its second argument in such a way that spaces, magic
+  shell characters, etc. will be preserved during various stages of
+  expansion done by the shell.  If you don't want this, use
+  AC_DEFINE_UNQUOTED instead.
+* Much textual processing done with external calls to tr and sed have been
+  internalized with builtin m4 `patsubst' and `translit' calls.
+* AC_OUTPUT doesn't hardwire the filenames it outputs.  Instead, you can
+  set the shell variables `gen_files' and `gen_config' to the list of
+  filenames to output.
+* AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
+  "lex.yy" or "lexyy", depending on the system. 
+* AC_PROGRAMS_CHECK takes an optional third arg.  If given, it is used as
+  the default value. 
+* If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
+* AC_CONST works much more reliably on more systems.
+* Many bug fixes.
+\f
+Major changes in release 1.3:
+
+configure no longer requires awk for packages that use a config.h.
+Support handling --with-PACKAGE options.
+New `autoheader' script to create `config.h.in' from `configure.in'.
+Ignore troublesome -lucb and -lPW when searching for alloca.
+Rename --exec_prefix to --exec-prefix for GNU standards conformance.
+Improve detection of STDC library.
+Add AC_HAVE_LIBRARY to check for non-default libraries.
+Function checking should work with future GNU libc releases.
+\f
+Major changes in release 1.2:
+
+The --srcdir option is now usually unnecessary.
+Add a file containing sample comments describing CPP macros.
+A comment in config.status tells which host it was configured on.
+Substituted variable values can now contain commas.
+Fix bugs in various feature checks.
+\f
+Major changes in release 1.1:
+
+Added AC_STRCOLL macro.
+Made AC_GETLOADAVG check for more things.
+AC_OUTPUT argument is now optional.
+Various bug fixes.