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diff --git a/pcre2-10.21/src/config.h.in b/pcre2-10.21/src/config.h.in
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+++ b/pcre2-10.21/src/config.h.in
@@ -0,0 +1,297 @@
+/* src/config.h.in.  Generated from configure.ac by autoheader.  */
+
+
+/* PCRE2 is written in Standard C, but there are a few non-standard things it
+can cope with, allowing it to run on SunOS4 and other "close to standard"
+systems.
+
+In environments that support the GNU autotools, config.h.in is converted into
+config.h by the "configure" script. In environments that use CMake,
+config-cmake.in is converted into config.h. If you are going to build PCRE2 "by
+hand" without using "configure" or CMake, you should copy the distributed
+config.h.generic to config.h, and edit the macro definitions to be the way you
+need them. You must then add -DHAVE_CONFIG_H to all of your compile commands,
+so that config.h is included at the start of every source.
+
+Alternatively, you can avoid editing by using -D on the compiler command line
+to set the macro values. In this case, you do not have to set -DHAVE_CONFIG_H,
+but if you do, default values will be taken from config.h for non-boolean
+macros that are not defined on the command line.
+
+Boolean macros such as HAVE_STDLIB_H and SUPPORT_PCRE2_8 should either be defined
+(conventionally to 1) for TRUE, and not defined at all for FALSE. All such
+macros are listed as a commented #undef in config.h.generic. Macros such as
+MATCH_LIMIT, whose actual value is relevant, have defaults defined, but are
+surrounded by #ifndef/#endif lines so that the value can be overridden by -D.
+
+PCRE2 uses memmove() if HAVE_MEMMOVE is defined; otherwise it uses bcopy() if
+HAVE_BCOPY is defined. If your system has neither bcopy() nor memmove(), make
+sure both macros are undefined; an emulation function will then be used. */
+
+/* By default, the \R escape sequence matches any Unicode line ending
+   character or sequence of characters. If BSR_ANYCRLF is defined (to any
+   value), this is changed so that backslash-R matches only CR, LF, or CRLF.
+   The build-time default can be overridden by the user of PCRE2 at runtime.
+   */
+#undef BSR_ANYCRLF
+
+/* If you are compiling for a system that uses EBCDIC instead of ASCII
+   character codes, define this macro to any value. When EBCDIC is set, PCRE2
+   assumes that all input strings are in EBCDIC. If you do not define this
+   macro, PCRE2 will assume input strings are ASCII or UTF-8/16/32 Unicode. It
+   is not possible to build a version of PCRE2 that supports both EBCDIC and
+   UTF-8/16/32. */
+#undef EBCDIC
+
+/* In an EBCDIC environment, define this macro to any value to arrange for the
+   NL character to be 0x25 instead of the default 0x15. NL plays the role that
+   LF does in an ASCII/Unicode environment. */
+#undef EBCDIC_NL25
+
+/* Define to 1 if you have the `bcopy' function. */
+#undef HAVE_BCOPY
+
+/* Define to 1 if you have the <bzlib.h> header file. */
+#undef HAVE_BZLIB_H
+
+/* Define to 1 if you have the <dirent.h> header file. */
+#undef HAVE_DIRENT_H
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#undef HAVE_DLFCN_H
+
+/* Define to 1 if you have the <editline/readline.h> header file. */
+#undef HAVE_EDITLINE_READLINE_H
+
+/* Define to 1 if you have the <edit/readline/readline.h> header file. */
+#undef HAVE_EDIT_READLINE_READLINE_H
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#undef HAVE_INTTYPES_H
+
+/* Define to 1 if you have the <limits.h> header file. */
+#undef HAVE_LIMITS_H
+
+/* Define to 1 if you have the `memmove' function. */
+#undef HAVE_MEMMOVE
+
+/* Define to 1 if you have the <memory.h> header file. */
+#undef HAVE_MEMORY_H
+
+/* Define if you have POSIX threads libraries and header files. */
+#undef HAVE_PTHREAD
+
+/* Have PTHREAD_PRIO_INHERIT. */
+#undef HAVE_PTHREAD_PRIO_INHERIT
+
+/* Define to 1 if you have the <readline/history.h> header file. */
+#undef HAVE_READLINE_HISTORY_H
+
+/* Define to 1 if you have the <readline/readline.h> header file. */
+#undef HAVE_READLINE_READLINE_H
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#undef HAVE_STDINT_H
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#undef HAVE_STDLIB_H
+
+/* Define to 1 if you have the `strerror' function. */
+#undef HAVE_STRERROR
+
+/* Define to 1 if you have the <strings.h> header file. */
+#undef HAVE_STRINGS_H
+
+/* Define to 1 if you have the <string.h> header file. */
+#undef HAVE_STRING_H
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#undef HAVE_SYS_STAT_H
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#undef HAVE_SYS_TYPES_H
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#undef HAVE_UNISTD_H
+
+/* Define to 1 if the compiler supports simple visibility declarations. */
+#undef HAVE_VISIBILITY
+
+/* Define to 1 if you have the <windows.h> header file. */
+#undef HAVE_WINDOWS_H
+
+/* Define to 1 if you have the <zlib.h> header file. */
+#undef HAVE_ZLIB_H
+
+/* PCRE2 uses recursive function calls to handle backtracking while matching.
+   This can sometimes be a problem on systems that have stacks of limited
+   size. Define HEAP_MATCH_RECURSE to any value to get a version that doesn't
+   use recursion in the match() function; instead it creates its own stack by
+   steam using memory from the heap. For more detail, see the comments and
+   other stuff just above the match() function. */
+#undef HEAP_MATCH_RECURSE
+
+/* The value of LINK_SIZE determines the number of bytes used to store links
+   as offsets within the compiled regex. The default is 2, which allows for
+   compiled patterns up to 64K long. This covers the vast majority of cases.
+   However, PCRE2 can also be compiled to use 3 or 4 bytes instead. This
+   allows for longer patterns in extreme cases. */
+#undef LINK_SIZE
+
+/* Define to the sub-directory where libtool stores uninstalled libraries. */
+#undef LT_OBJDIR
+
+/* The value of MATCH_LIMIT determines the default number of times the
+   internal match() function can be called during a single execution of
+   pcre2_match(). There is a runtime interface for setting a different limit.
+   The limit exists in order to catch runaway regular expressions that take
+   for ever to determine that they do not match. The default is set very large
+   so that it does not accidentally catch legitimate cases. */
+#undef MATCH_LIMIT
+
+/* The above limit applies to all calls of match(), whether or not they
+   increase the recursion depth. In some environments it is desirable to limit
+   the depth of recursive calls of match() more strictly, in order to restrict
+   the maximum amount of stack (or heap, if HEAP_MATCH_RECURSE is defined)
+   that is used. The value of MATCH_LIMIT_RECURSION applies only to recursive
+   calls of match(). To have any useful effect, it must be less than the value
+   of MATCH_LIMIT. The default is to use the same value as MATCH_LIMIT. There
+   is a runtime method for setting a different limit. */
+#undef MATCH_LIMIT_RECURSION
+
+/* This limit is parameterized just in case anybody ever wants to change it.
+   Care must be taken if it is increased, because it guards against integer
+   overflow caused by enormously large patterns. */
+#undef MAX_NAME_COUNT
+
+/* This limit is parameterized just in case anybody ever wants to change it.
+   Care must be taken if it is increased, because it guards against integer
+   overflow caused by enormously large patterns. */
+#undef MAX_NAME_SIZE
+
+/* Defining NEVER_BACKSLASH_C locks out the use of \C in all patterns. */
+#undef NEVER_BACKSLASH_C
+
+/* The value of NEWLINE_DEFAULT determines the default newline character
+   sequence. PCRE2 client programs can override this by selecting other values
+   at run time. The valid values are 1 (CR), 2 (LF), 3 (CRLF), 4 (ANY), and 5
+   (ANYCRLF). */
+#undef NEWLINE_DEFAULT
+
+/* Name of package */
+#undef PACKAGE
+
+/* Define to the address where bug reports for this package should be sent. */
+#undef PACKAGE_BUGREPORT
+
+/* Define to the full name of this package. */
+#undef PACKAGE_NAME
+
+/* Define to the full name and version of this package. */
+#undef PACKAGE_STRING
+
+/* Define to the one symbol short name of this package. */
+#undef PACKAGE_TARNAME
+
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
+/* Define to the version of this package. */
+#undef PACKAGE_VERSION
+
+/* The value of PARENS_NEST_LIMIT specifies the maximum depth of nested
+   parentheses (of any kind) in a pattern. This limits the amount of system
+   stack that is used while compiling a pattern. */
+#undef PARENS_NEST_LIMIT
+
+/* The value of PCRE2GREP_BUFSIZE determines the size of buffer used by
+   pcre2grep to hold parts of the file it is searching. This is also the
+   minimum value. The actual amount of memory used by pcre2grep is three times
+   this number, because it allows for the buffering of "before" and "after"
+   lines. */
+#undef PCRE2GREP_BUFSIZE
+
+/* to make a symbol visible */
+#undef PCRE2POSIX_EXP_DECL
+
+/* to make a symbol visible */
+#undef PCRE2POSIX_EXP_DEFN
+
+/* Define to any value to include debugging code. */
+#undef PCRE2_DEBUG
+
+/* to make a symbol visible */
+#undef PCRE2_EXP_DECL
+
+
+/* If you are compiling for a system other than a Unix-like system or
+   Win32, and it needs some magic to be inserted before the definition
+   of a function that is exported by the library, define this macro to
+   contain the relevant magic. If you do not define this macro, a suitable
+    __declspec value is used for Windows systems; in other environments
+   "extern" is used for a C compiler and "extern C" for a C++ compiler.
+   This macro apears at the start of every exported function that is part
+   of the external API. It does not appear on functions that are "external"
+   in the C sense, but which are internal to the library. */
+#undef PCRE2_EXP_DEFN
+
+/* Define to any value if linking statically (TODO: make nice with Libtool) */
+#undef PCRE2_STATIC
+
+/* Define to necessary symbol if this constant uses a non-standard name on
+   your system. */
+#undef PTHREAD_CREATE_JOINABLE
+
+/* Define to 1 if you have the ANSI C header files. */
+#undef STDC_HEADERS
+
+/* Define to any value to enable support for Just-In-Time compiling. */
+#undef SUPPORT_JIT
+
+/* Define to any value to allow pcre2grep to be linked with libbz2, so that it
+   is able to handle .bz2 files. */
+#undef SUPPORT_LIBBZ2
+
+/* Define to any value to allow pcre2test to be linked with libedit. */
+#undef SUPPORT_LIBEDIT
+
+/* Define to any value to allow pcre2test to be linked with libreadline. */
+#undef SUPPORT_LIBREADLINE
+
+/* Define to any value to allow pcre2grep to be linked with libz, so that it
+   is able to handle .gz files. */
+#undef SUPPORT_LIBZ
+
+/* Define to any value to enable JIT support in pcre2grep. */
+#undef SUPPORT_PCRE2GREP_JIT
+
+/* Define to any value to enable the 16 bit PCRE2 library. */
+#undef SUPPORT_PCRE2_16
+
+/* Define to any value to enable the 32 bit PCRE2 library. */
+#undef SUPPORT_PCRE2_32
+
+/* Define to any value to enable the 8 bit PCRE2 library. */
+#undef SUPPORT_PCRE2_8
+
+/* Define to any value to enable support for Unicode and UTF encoding. This
+   will work even in an EBCDIC environment, but it is incompatible with the
+   EBCDIC macro. That is, PCRE2 can support *either* EBCDIC code *or*
+   ASCII/Unicode, but not both at once. */
+#undef SUPPORT_UNICODE
+
+/* Define to any value for valgrind support to find invalid memory reads. */
+#undef SUPPORT_VALGRIND
+
+/* Version number of package */
+#undef VERSION
+
+/* Define to empty if `const' does not conform to ANSI C. */
+#undef const
+
+/* Define to the type of a signed integer type of width exactly 64 bits if
+   such a type exists and the standard includes do not define it. */
+#undef int64_t
+
+/* Define to `unsigned int' if <sys/types.h> does not define. */
+#undef size_t