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PERLCYGWIN(1)	       Perl Programmers Reference Guide		 PERLCYGWIN(1)

NAME
       README.cygwin - Perl for Cygwin

SYNOPSIS
       This document will help you configure, make, test and install Perl on
       Cygwin.	This document also describes features of Cygwin that will
       affect how Perl behaves at runtime.

       NOTE: There are pre-built Perl packages available for Cygwin and a
       version of Perl is provided in the normal Cygwin install.  If you do
       not need to customize the configuration, consider using one of those
       packages.

PREREQUISITES FOR COMPILING PERL ON CYGWIN
   Cygwin = GNU+Cygnus+Windows (Don't leave UNIX without it)
       The Cygwin tools are ports of the popular GNU development tools for
       Win32 platforms.	 They run thanks to the Cygwin library which provides
       the UNIX system calls and environment these programs expect.  More
       information about this project can be found at:

	 F<http://www.cygwin.com/>

       A recent net or commercial release of Cygwin is required.

       At the time this document was last updated, Cygwin 1.5.24 was current.

   Cygwin Configuration
       While building Perl some changes may be necessary to your Cygwin setup
       so that Perl builds cleanly.  These changes are not required for normal
       Perl usage.

       NOTE: The binaries that are built will run on all Win32 versions.  They
       do not depend on your host system (Win9x/WinME, WinNT/Win2K) or your
       Cygwin configuration (ntea, ntsec, binary/text mounts).	The only
       dependencies come from hard-coded pathnames like "/usr/local".
       However, your host system and Cygwin configuration will affect Perl's
       runtime behavior (see "TEST").

       ·   "PATH"

	   Set the "PATH" environment variable so that Configure finds the
	   Cygwin versions of programs.	 Any Windows directories should be
	   removed or moved to the end of your "PATH".

       ·   nroff

	   If you do not have nroff (which is part of the groff package),
	   Configure will not prompt you to install man pages.

       ·   Permissions

	   On WinNT with either the ntea or ntsec "CYGWIN" settings, directory
	   and file permissions may not be set correctly.  Since the build
	   process creates directories and files, to be safe you may want to
	   run a "chmod -R +w *" on the entire Perl source tree.

	   Also, it is a well known WinNT "feature" that files created by a
	   login that is a member of the Administrators group will be owned by
	   the Administrators group.  Depending on your umask, you may find
	   that you can not write to files that you just created (because you
	   are no longer the owner).  When using the ntsec "CYGWIN" setting,
	   this is not an issue because it "corrects" the ownership to what
	   you would expect on a UNIX system.

CONFIGURE PERL ON CYGWIN
       The default options gathered by Configure with the assistance of
       hints/cygwin.sh will build a Perl that supports dynamic loading (which
       requires a shared libperl.dll).

       This will run Configure and keep a record:

	 ./Configure 2>&1 | tee log.configure

       If you are willing to accept all the defaults run Configure with -de.
       However, several useful customizations are available.

   Stripping Perl Binaries on Cygwin
       It is possible to strip the EXEs and DLLs created by the build process.
       The resulting binaries will be significantly smaller.  If you want the
       binaries to be stripped, you can either add a -s option when Configure
       prompts you,

	 Any additional ld flags (NOT including libraries)? [none] -s
	 Any special flags to pass to g++ to create a dynamically loaded library?
	 [none] -s
	 Any special flags to pass to gcc to use dynamic linking? [none] -s

       or you can edit hints/cygwin.sh and uncomment the relevant variables
       near the end of the file.

   Optional Libraries for Perl on Cygwin
       Several Perl functions and modules depend on the existence of some
       optional libraries.  Configure will find them if they are installed in
       one of the directories listed as being used for library searches.  Pre-
       built packages for most of these are available from the Cygwin
       installer.

       ·   "-lcrypt"

	   The crypt package distributed with Cygwin is a Linux compatible
	   56-bit DES crypt port by Corinna Vinschen.

	   Alternatively, the crypt libraries in GNU libc have been ported to
	   Cygwin.

	   The DES based Ultra Fast Crypt port was done by Alexey Truhan:

	     ftp://ftp.uni-erlangen.de/pub/pc/gnuwin32/cygwin/porters/Okhapkin_Sergey/cw32crypt-dist-0.tgz

	   NOTE: There are various export restrictions on DES implementations,
	   see the glibc README for more details.

	   The MD5 port was done by Andy Piper:

	     ftp://ftp.uni-erlangen.de/pub/pc/gnuwin32/cygwin/porters/Okhapkin_Sergey/libcrypt.tgz

       ·   "-lgdbm_compat" ("use GDBM_File")

	   GDBM is available for Cygwin.

	   NOTE: The GDBM library only works on NTFS partitions.

       ·   "-ldb" ("use DB_File")

	   BerkeleyDB is available for Cygwin.

	   NOTE: The BerkeleyDB library only completely works on NTFS
	   partitions and db-4.3 is flawed.

       ·   "cygserver" ("use IPC::SysV")

	   A port of SysV IPC is available for Cygwin.

	   NOTE: This has not been extensively tested.	In particular,
	   "d_semctl_semun" is undefined because it fails a Configure test and
	   on Win9x the shm*() functions seem to hang.	It also creates a
	   compile time dependency because perl.h includes <sys/ipc.h> and
	   <sys/sem.h> (which will be required in the future when compiling
	   CPAN modules). CURRENTLY NOT SUPPORTED!

       ·   "-lutil"

	   Included with the standard Cygwin netrelease is the inetutils
	   package which includes libutil.a.

   Configure-time Options for Perl on Cygwin
       The INSTALL document describes several Configure-time options.  Some of
       these will work with Cygwin, others are not yet possible.  Also, some
       of these are experimental.  You can either select an option when
       Configure prompts you or you can define (undefine) symbols on the
       command line.

       ·   "-Uusedl"

	   Undefining this symbol forces Perl to be compiled statically.

       ·   "-Uusemymalloc"

	   By default Perl uses the "malloc()" included with the Perl source.
	   If you want to force Perl to build with the system "malloc()"
	   undefine this symbol.

       ·   "-Uuseperlio"

	   Undefining this symbol disables the PerlIO abstraction.  PerlIO is
	   now the default; it is not recommended to disable PerlIO.

       ·   "-Dusemultiplicity"

	   Multiplicity is required when embedding Perl in a C program and
	   using more than one interpreter instance.  This works with the
	   Cygwin port.

       ·   "-Duse64bitint"

	   By default Perl uses 32 bit integers.  If you want to use larger 64
	   bit integers, define this symbol.

       ·   "-Duselongdouble"

	   gcc supports long doubles (12 bytes).  However, several additional
	   long double math functions are necessary to use them within Perl
	   ({atan2, cos, exp, floor, fmod, frexp, isnan, log, modf, pow, sin,
	   sqrt}l, strtold).  These are not yet available with Cygwin.

       ·   "-Dusethreads"

	   POSIX threads are implemented in Cygwin, define this symbol if you
	   want a threaded perl.

       ·   "-Duselargefiles"

	   Cygwin uses 64-bit integers for internal size and position
	   calculations, this will be correctly detected and defined by
	   Configure.

       ·   "-Dmksymlinks"

	   Use this to build perl outside of the source tree.  This works with
	   Cygwin.  Details can be found in the INSTALL document.  This is the
	   recommended way to build perl from sources.

   Suspicious Warnings on Cygwin
       You may see some messages during Configure that seem suspicious.

       ·   Win9x and "d_eofnblk"

	   Win9x does not correctly report "EOF" with a non-blocking read on a
	   closed pipe.	 You will see the following messages:

	     But it also returns -1 to signal EOF, so be careful!
	     WARNING: you can't distinguish between EOF and no data!

	     *** WHOA THERE!!! ***
		 The recommended value for $d_eofnblk on this machine was "define"!
		 Keep the recommended value? [y]

	   At least for consistency with WinNT, you should keep the
	   recommended value.

       ·   Compiler/Preprocessor defines

	   The following error occurs because of the Cygwin "#define" of
	   "_LONG_DOUBLE":

	     Guessing which symbols your C compiler and preprocessor define...
	     try.c:<line#>: missing binary operator

	   This failure does not seem to cause any problems.  With older gcc
	   versions, "parse error" is reported instead of "missing binary
	   operator".

MAKE ON CYGWIN
       Simply run make and wait:

	 make 2>&1 | tee log.make

TEST ON CYGWIN
       There are two steps to running the test suite:

	 make test 2>&1 | tee log.make-test

	 cd t; ./perl harness 2>&1 | tee ../log.harness

       The same tests are run both times, but more information is provided
       when running as "./perl harness".

       Test results vary depending on your host system and your Cygwin
       configuration.  If a test can pass in some Cygwin setup, it is always
       attempted and explainable test failures are documented.	It is possible
       for Perl to pass all the tests, but it is more likely that some tests
       will fail for one of the reasons listed below.

   File Permissions on Cygwin
       UNIX file permissions are based on sets of mode bits for
       {read,write,execute} for each {user,group,other}.  By default Cygwin
       only tracks the Win32 read-only attribute represented as the UNIX file
       user write bit (files are always readable, files are executable if they
       have a .{com,bat,exe} extension or begin with "#!", directories are
       always readable and executable).	 On WinNT with the ntea "CYGWIN"
       setting, the additional mode bits are stored as extended file
       attributes.  On WinNT with the default ntsec "CYGWIN" setting,
       permissions use the standard WinNT security descriptors and access
       control lists. Without one of these options, these tests will fail
       (listing not updated yet):

	 Failed Test	       List of failed
	 ------------------------------------
	 io/fs.t	       5, 7, 9-10
	 lib/anydbm.t	       2
	 lib/db-btree.t	       20
	 lib/db-hash.t	       16
	 lib/db-recno.t	       18
	 lib/gdbm.t	       2
	 lib/ndbm.t	       2
	 lib/odbm.t	       2
	 lib/sdbm.t	       2
	 op/stat.t	       9, 20 (.tmp not an executable extension)

   NDBM_File and ODBM_File do not work on FAT filesystems
       Do not use NDBM_File or ODBM_File on FAT filesystem.  They can be built
       on a FAT filesystem, but many tests will fail:

	../ext/NDBM_File/ndbm.t	      13  3328	  71   59  83.10%  1-2 4 16-71
	../ext/ODBM_File/odbm.t	     255 65280	  ??   ??	%  ??
	../lib/AnyDBM_File.t	       2   512	  12	2  16.67%  1 4
	../lib/Memoize/t/errors.t      0   139	  11	5  45.45%  7-11
	../lib/Memoize/t/tie_ndbm.t   13  3328	   4	4 100.00%  1-4
	run/fresh_perl.t			  97	1   1.03%  91

       If you intend to run only on FAT (or if using AnyDBM_File on FAT), run
       Configure with the -Ui_ndbm and -Ui_dbm options to prevent NDBM_File
       and ODBM_File being built.

       With NTFS (and no CYGWIN=nontsec), there should be no problems even if
       perl was built on FAT.

   "fork()" failures in io_* tests
       A "fork()" failure may result in the following tests failing:

	 ext/IO/lib/IO/t/io_multihomed.t
	 ext/IO/lib/IO/t/io_sock.t
	 ext/IO/lib/IO/t/io_unix.t

       See comment on fork in Miscellaneous below.

Specific features of the Cygwin port
   Script Portability on Cygwin
       Cygwin does an outstanding job of providing UNIX-like semantics on top
       of Win32 systems.  However, in addition to the items noted above, there
       are some differences that you should know about.	 This is a very brief
       guide to portability, more information can be found in the Cygwin
       documentation.

       ·   Pathnames

	   Cygwin pathnames can be separated by forward (/) or backward (\\)
	   slashes.  They may also begin with drive letters (C:) or Universal
	   Naming Codes (//UNC).  DOS device names (aux, con, prn, com*, lpt?,
	   nul) are invalid as base filenames.	However, they can be used in
	   extensions (e.g., hello.aux).  Names may contain all printable
	   characters except these:

	     : * ? " < > |

	   File names are case insensitive, but case preserving.  A pathname
	   that contains a backslash or drive letter is a Win32 pathname (and
	   not subject to the translations applied to POSIX style pathnames).

	   For conversion we have "Cygwin::win_to_posix_path()" and
	   "Cygwin::posix_to_win_path()".

	   Pathnames may not contain Unicode characters. "Cygwin" still uses
	   the ANSI API calls and no Unicode calls because of newlib
	   deficiencies.  There's an unofficial unicode patch for cygwin at
	   http://www.okisoft.co.jp/esc/utf8-cygwin/

       ·   Text/Binary

	   When a file is opened it is in either text or binary mode.  In text
	   mode a file is subject to CR/LF/Ctrl-Z translations.	 With Cygwin,
	   the default mode for an "open()" is determined by the mode of the
	   mount that underlies the file. See "Cygwin::is_binmount()". Perl
	   provides a "binmode()" function to set binary mode on files that
	   otherwise would be treated as text.	"sysopen()" with the "O_TEXT"
	   flag sets text mode on files that otherwise would be treated as
	   binary:

	       sysopen(FOO, "bar", O_WRONLY|O_CREAT|O_TEXT)

	   "lseek()", "tell()" and "sysseek()" only work with files opened in
	   binary mode.

	   The text/binary issue is covered at length in the Cygwin
	   documentation.

       ·   PerlIO

	   PerlIO overrides the default Cygwin Text/Binary behaviour.  A file
	   will always be treated as binary, regardless of the mode of the
	   mount it lives on, just like it is in UNIX.	So CR/LF translation
	   needs to be requested in either the "open()" call like this:

	     open(FH, ">:crlf", "out.txt");

	   which will do conversion from LF to CR/LF on the output, or in the
	   environment settings (add this to your .bashrc):

	     export PERLIO=crlf

	   which will pull in the crlf PerlIO layer which does LF -> CRLF
	   conversion on every output generated by perl.

       ·   .exe

	   The Cygwin "stat()", "lstat()" and "readlink()" functions make the
	   .exe extension transparent by looking for foo.exe when you ask for
	   foo (unless a foo also exists).  Cygwin does not require a .exe
	   extension, but gcc adds it automatically when building a program.
	   However, when accessing an executable as a normal file (e.g., cp in
	   a makefile) the .exe is not transparent.  The install included with
	   Cygwin automatically appends a .exe when necessary.

       ·   Cygwin vs. Windows process ids

	   Cygwin processes have their own pid, which is different from the
	   underlying windows pid.  Most posix compliant Proc functions expect
	   the cygwin pid, but several Win32::Process functions expect the
	   winpid. E.g. $$ is the cygwin pid of /usr/bin/perl, which is not
	   the winpid.	Use "Cygwin::winpid_to_pid()" and
	   "Cygwin::winpid_to_pid()" to translate between them.

       ·   Cygwin vs. Windows errors

	   Under Cygwin, $^E is the same as $!.	 When using Win32 API
	   Functions, use "Win32::GetLastError()" to get the last Windows
	   error.

       ·   "chown()"

	   On WinNT "chown()" can change a file's user and group IDs.  On
	   Win9x "chown()" is a no-op, although this is appropriate since
	   there is no security model.

       ·   Miscellaneous

	   File locking using the "F_GETLK" command to "fcntl()" is a stub
	   that returns "ENOSYS".

	   Win9x can not "rename()" an open file (although WinNT can).

	   The Cygwin "chroot()" implementation has holes (it can not restrict
	   file access by native Win32 programs).

	   Inplace editing "perl -i" of files doesn't work without doing a
	   backup of the file being edited "perl -i.bak" because of windowish
	   restrictions, therefore Perl adds the suffix ".bak" automatically
	   if you use "perl -i" without specifying a backup extension.

	   Using "fork()" after loading multiple dlls may fail with an
	   internal cygwin error like the following:

	     C:\CYGWIN\BIN\PERL.EXE: *** couldn't allocate memory 0x10000(4128768) for 'C:\CYGWIN\LIB\PERL5\5.6.1\CYGWIN-MULTI\AUTO\SOCKET\SOCKET.DLL' alignment, Win32 error 8

	       200 [main] perl 377147 sync_with_child: child -395691(0xB8) died before initialization with status code 0x1
	      1370 [main] perl 377147 sync_with_child: *** child state child loading dlls

	   Use the rebase utility to resolve the conflicting dll addresses.
	   The rebase package is included in the Cygwin netrelease.  Use
	   setup.exe from http://www.cygwin.com/setup.exe to install it and
	   run rebaseall.

   Prebuilt methods:
       "Cwd::cwd"
	   Returns the current working directory.

       "Cygwin::pid_to_winpid"
	   Translates a cygwin pid to the corresponding Windows pid (which may
	   or may not be the same).

       "Cygwin::winpid_to_pid"
	   Translates a Windows pid to the corresponding cygwin pid (if any).

       "Cygwin::win_to_posix_path"
	   Translates a Windows path to the corresponding cygwin path
	   respecting the current mount points. With a second non-null
	   argument returns an absolute path. Double-byte characters will not
	   be translated.

       "Cygwin::posix_to_win_path"
	   Translates a cygwin path to the corresponding cygwin path
	   respecting the current mount points. With a second non-null
	   argument returns an absolute path. Double-byte characters will not
	   be translated.

       "Cygwin::mount_table()"
	   Returns an array of [mnt_dir, mnt_fsname, mnt_type, mnt_opts].

	     perl -e 'for $i (Cygwin::mount_table) {print join(" ",@$i),"\n";}'
	     /bin c:\cygwin\bin system binmode,cygexec
	     /usr/bin c:\cygwin\bin system binmode
	     /usr/lib c:\cygwin\lib system binmode
	     / c:\cygwin system binmode
	     /cygdrive/c c: system binmode,noumount
	     /cygdrive/d d: system binmode,noumount
	     /cygdrive/e e: system binmode,noumount

       "Cygwin::mount_flags"
	   Returns the mount type and flags for a specified mount point.  A
	   comma-separated string of mntent->mnt_type (always "system" or
	   "user"), then the mntent->mnt_opts, where the first is always
	   "binmode" or "textmode".

	     system|user,binmode|textmode,exec,cygexec,cygdrive,mixed,
	     notexec,managed,nosuid,devfs,proc,noumount

	   If the argument is "/cygdrive", then just the volume mount
	   settings, and the cygdrive mount prefix are returned.

	   User mounts override system mounts.

	     $ perl -e 'print Cygwin::mount_flags "/usr/bin"'
	     system,binmode,cygexec
	     $ perl -e 'print Cygwin::mount_flags "/cygdrive"'
	     binmode,cygdrive,/cygdrive

       "Cygwin::is_binmount"
	   Returns true if the given cygwin path is binary mounted, false if
	   the path is mounted in textmode.

INSTALL PERL ON CYGWIN
       This will install Perl, including man pages.

	 make install 2>&1 | tee log.make-install

       NOTE: If "STDERR" is redirected "make install" will not prompt you to
       install perl into /usr/bin.

       You may need to be Administrator to run "make install".	If you are
       not, you must have write access to the directories in question.

       Information on installing the Perl documentation in HTML format can be
       found in the INSTALL document.

MANIFEST ON CYGWIN
       These are the files in the Perl release that contain references to
       Cygwin.	These very brief notes attempt to explain the reason for all
       conditional code.  Hopefully, keeping this up to date will allow the
       Cygwin port to be kept as clean as possible.

       Documentation
	     INSTALL README.cygwin README.win32 MANIFEST
	     pod/perl.pod pod/perlport.pod pod/perlfaq3.pod
	     pod/perldelta.pod pod/perl5004delta.pod pod/perl56delta.pod
	     pod/perl561delta.pod pod/perl570delta.pod pod/perl572delta.pod
	     pod/perl573delta.pod pod/perl58delta.pod pod/perl581delta.pod
	     pod/perl590delta.pod pod/perlhist.pod pod/perlmodlib.pod
	     pod/perltoc.pod pod.lst Porting/Glossary pod/perlrepository.pod
	     Porting/checkAUTHORS.pl
	     ext/Compress-Raw-Zlib/Changes ext/Compress-Raw-Zlib/README
	     ext/Compress-Zlib/Changes ext/Cwd/Changes ext/DB_File/Changes
	     ext/Encode/Changes ext/Sys-Syslog/Changes ext/Time-HiRes/Changes
	     ext/Win32API-File/Changes lib/CGI/Changes lib/ExtUtils/CBuilder/Changes
	     lib/ExtUtils/Changes lib/ExtUtils/NOTES lib/ExtUtils/PATCHING
	     lib/ExtUtils/README lib/Module/Build/Changes lib/Net/Ping/Changes
	     lib/Test/Harness/Changes
	     lib/Term/ANSIColor/ChangeLog lib/Term/ANSIColor/README
	     README.symbian symbian/TODO

       Build, Configure, Make, Install
	     cygwin/Makefile.SHs
	     ext/IPC/SysV/hints/cygwin.pl
	     ext/NDBM_File/hints/cygwin.pl
	     ext/ODBM_File/hints/cygwin.pl
	     hints/cygwin.sh
	     Configure		   - help finding hints from uname,
				     shared libperl required for dynamic loading
	     Makefile.SH Cross/Makefile-cross-SH
				   - linklibperl
	     Porting/patchls	   - cygwin in port list
	     installman		   - man pages with :: translated to .
	     installperl	   - install dll, install to 'pods'
	     makedepend.SH	   - uwinfix
	     regen_lib.pl	   - file permissions

	     NetWare/Makefile
	     plan9/mkfile
	     symbian/sanity.pl symbian/sisify.pl
	     hints/uwin.sh
	     vms/descrip_mms.template
	     win32/Makefile win32/makefile.mk

       Tests
	     t/io/fs.t		   - no file mode checks if not ntsec
				     skip rename() check when not check_case:relaxed
	     t/io/tell.t	   - binmode
	     t/lib/cygwin.t	   - builtin cygwin function tests
	     t/op/groups.t	   - basegroup has ID = 0
	     t/op/magic.t	   - $^X/symlink WORKAROUND, s/.exe//
	     t/op/stat.t	   - no /dev, skip Win32 ftCreationTime quirk
				     (cache manager sometimes preserves ctime of file
				     previously created and deleted), no -u (setuid)
	     t/op/taint.t	   - can't use empty path under Cygwin Perl
	     t/op/time.t	   - no tzset()

       Compiled Perl Source
	     EXTERN.h		   - __declspec(dllimport)
	     XSUB.h		   - __declspec(dllexport)
	     cygwin/cygwin.c	   - os_extras (getcwd, spawn, and several Cygwin:: functions)
	     perl.c		   - os_extras, -i.bak
	     perl.h		   - binmode
	     doio.c		   - win9x can not rename a file when it is open
	     pp_sys.c		   - do not define h_errno, init _pwent_struct.pw_comment
	     util.c		   - use setenv
	     util.h		   - PERL_FILE_IS_ABSOLUTE macro
	     pp.c		   - Comment about Posix vs IEEE math under Cygwin
	     perlio.c		   - CR/LF mode
	     perliol.c		   - Comment about EXTCONST under Cygwin

       Compiled Module Source
	     ext/Compress-Raw-Zlib/Makefile.PL
				   - Can't install via CPAN shell under Cygwin
	     ext/Compress-Raw-Zlib/zlib-src/zutil.h
				   - Cygwin is Unix-like and has vsnprintf
	     ext/Errno/Errno_pm.PL - Special handling for Win32 Perl under Cygwin
	     ext/POSIX/POSIX.xs	   - tzname defined externally
	     ext/SDBM_File/sdbm/pair.c
				   - EXTCONST needs to be redefined from EXTERN.h
	     ext/SDBM_File/sdbm/sdbm.c
				   - binary open
	     ext/Sys/Syslog/Syslog.xs
				   - Cygwin has syslog.h
	     ext/Sys/Syslog/win32/compile.pl
				   - Convert paths to Windows paths
	     ext/Time-HiRes/HiRes.xs
				   - Various timers not available
	     ext/Time-HiRes/Makefile.PL
				   - Find w32api/windows.h
	     ext/Win32/Makefile.PL - Use various libraries under Cygwin
	     ext/Win32/Win32.xs	   - Child dir and child env under Cygwin
	     ext/Win32API-File/File.xs
				   - _open_osfhandle not implemented under Cygwin
	     ext/Win32CORE/Win32CORE.c
				   - __declspec(dllexport)

       Perl Modules/Scripts
	     ext/B/t/OptreeCheck.pm - Comment about stderr/stdout order under Cygwin
	     ext/Digest-SHA/bin/shasum
				   - Use binary mode under Cygwin
	     ext/Sys/Syslog/win32/Win32.pm
				   - Convert paths to Windows paths
	     ext/Time-HiRes/HiRes.pm
				   - Comment about various timers not available
	     ext/Win32API-File/File.pm
				   - _open_osfhandle not implemented under Cygwin
	     ext/Win32CORE/Win32CORE.pm
				   - History of Win32CORE under Cygwin
	     lib/CGI.pm		   - binmode and path separator
	     lib/CPANPLUS/Dist/MM.pm - Commented out code that fails under Win32/Cygwin
	     lib/CPANPLUS/Internals/Constants/Report.pm
				   - OS classifications
	     lib/CPANPLUS/Internals/Constants.pm
				   - Contants for Cygwin
	     lib/CPANPLUS/Internals/Report.pm
				   - Example of Cygwin report
	     lib/CPANPLUS/Module.pm
				   - Abort if running on old Cygwin version
	     lib/Cwd.pm		   - hook to internal Cwd::cwd
	     lib/ExtUtils/CBuilder/Platform/cygwin.pm
				   - use gcc for ld, and link to libperl.dll.a
	     lib/ExtUtils/CBuilder.pm
				   - Cygwin is Unix-like
	     lib/ExtUtils/Install.pm - Install and rename issues under Cygwin
	     lib/ExtUtils/MM.pm	   - OS classifications
	     lib/ExtUtils/MM_Any.pm - Example for Cygwin
	     lib/ExtUtils/MakeMaker.pm
				   - require MM_Cygwin.pm
	     lib/ExtUtils/MM_Cygwin.pm
				   - canonpath, cflags, manifypods, perl_archive
	     lib/File/Fetch.pm	   - Comment about quotes using a Cygwin example
	     lib/File/Find.pm	   - on remote drives stat() always sets st_nlink to 1
	     lib/File/Spec/Cygwin.pm - case_tolerant
	     lib/File/Spec/Unix.pm - preserve //unc
	     lib/File/Spec/Win32.pm - References a message on cygwin.com
	     lib/File/Spec.pm	   - Pulls in lib/File/Spec/Cygwin.pm
	     lib/File/Temp.pm	   - no directory sticky bit
	     lib/Module/Build/Compat.pm - Comment references 'make' under Cygwin
	     lib/Module/Build/Platform/cygwin.pm
				   - Use '.' for man page separator
	     lib/Module/Build.pm   - Cygwin is Unix-like
	     lib/Module/CoreList.pm - List of all module files and versions
	     lib/Net/Domain.pm	   - No domainname command under Cygwin
	     lib/Net/Netrc.pm	   - Bypass using stat() under Cygwin
	     lib/Net/Ping.pm	   - ECONREFUSED is EAGAIN under Cygwin
	     lib/Pod/Find.pm	   - Set 'pods' dir
	     lib/Pod/Perldoc/ToMan.pm - '-c' switch for pod2man
	     lib/Pod/Perldoc.pm	   - Use 'less' pager, and use .exe extension
	     lib/Term/ANSIColor.pm - Cygwin terminal info
	     lib/perl5db.pl	   - use stdin not /dev/tty
	     utils/perlbug.PL	   - Add CYGWIN environment variable to report

       Perl Module Tests
	     ext/Compress-Zlib/t/14gzopen.t
	     ext/Cwd/t/cwd.t
	     ext/DB_File/t/db-btree.t
	     ext/DB_File/t/db-hash.t
	     ext/DB_File/t/db-recno.t
	     ext/DynaLoader/t/DynaLoader.t
	     ext/File-Glob/t/basic.t
	     ext/GDBM_File/t/gdbm.t
	     ext/POSIX/t/sysconf.t
	     ext/POSIX/t/time.t
	     ext/SDBM_File/t/sdbm.t
	     ext/Sys/Syslog/t/syslog.t
	     ext/Time-HiRes/t/HiRes.t
	     ext/Win32/t/Unicode.t
	     ext/Win32API-File/t/file.t
	     ext/Win32CORE/t/win32core.t
	     lib/AnyDBM_File.t
	     lib/Archive/Extract/t/01_Archive-Extract.t
	     lib/Archive/Tar/t/02_methods.t
	     lib/CPANPLUS/t/05_CPANPLUS-Internals-Fetch.t
	     lib/CPANPLUS/t/20_CPANPLUS-Dist-MM.t
	     lib/ExtUtils/t/Embed.t
	     lib/ExtUtils/t/eu_command.t
	     lib/ExtUtils/t/MM_Cygwin.t
	     lib/ExtUtils/t/MM_Unix.t
	     lib/File/Compare.t
	     lib/File/Copy.t
	     lib/File/Find/t/find.t
	     lib/File/Path.t
	     lib/File/Spec/t/crossplatform.t
	     lib/File/Spec/t/Spec.t
	     lib/Module/Build/t/destinations.t
	     lib/Net/hostent.t
	     lib/Net/Ping/t/110_icmp_inst.t
	     lib/Net/Ping/t/500_ping_icmp.t
	     lib/Net/t/netrc.t
	     lib/Pod/Simple/t/perlcyg.pod
	     lib/Pod/Simple/t/perlcygo.txt
	     lib/Pod/Simple/t/perlfaq.pod
	     lib/Pod/Simple/t/perlfaqo.txt
	     lib/User/grent.t
	     lib/User/pwent.t

BUGS ON CYGWIN
       Support for swapping real and effective user and group IDs is
       incomplete.  On WinNT Cygwin provides "setuid()", "seteuid()",
       "setgid()" and "setegid()".  However, additional Cygwin calls for
       manipulating WinNT access tokens and security contexts are required.

AUTHORS
       Charles Wilson <cwilson@ece.gatech.edu>, Eric Fifer
       <egf7@columbia.edu>, alexander smishlajev <als@turnhere.com>, Steven
       Morlock <newspost@morlock.net>, Sebastien Barre
       <Sebastien.Barre@utc.fr>, Teun Burgers <burgers@ecn.nl>, Gerrit P.
       Haase <gp@familiehaase.de>, Reini Urban <rurban@cpan.org>, Jan Dubois
       <jand@activestate.com>, Jerry D. Hedden <jdhedden@cpan.org>.

HISTORY
       Last updated: 2007-09-25

perl v5.10.1			  2009-05-12			 PERLCYGWIN(1)
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