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278 lines
13 KiB
Plaintext
README.MinGW
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============
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Contributed by Keith Marshall (keith.d.marshall@ntlworld.com)
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INTRODUCTION
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------------
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This file provides recommendations for building a Win32 implementation of
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GNU Groff, using the MinGW port of GCC for Microsoft (TM) Windows-32
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platforms. It is intended to supplement the standard installation
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instructions (see file INSTALL); it does not replace them.
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You require both the MinGW implementation of GCC and its supporting MSYS
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toolkit, which provides a Win-32 implementation of the GNU bash shell, and a
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few other essential utilities; these may be obtained from
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http://sourceforge.net/projects/mingw
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by following the appropriate download links, where they are available as
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self-extracting executable installation packages. If installing both from
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scratch, it is recommended that MinGW is installed first, as the MSYS
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installer can then automatically set up the proper environment for running
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MinGW.
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Additionally, if you wish to compile groff with support for its HTML output
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capability, some additional tools are required as decribed in the section
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PREREQUISITES FOR HTML OUTPUT later in this file.
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BUILDING GROFF WITH MINGW
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-------------------------
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Assuming that you have obtained the appropriate groff distribution, and that
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you are already running an MSYS shell, then the configuration, compilation,
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and installation of groff, using MinGW, is performed in much the same way as
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it is described in the INSTALL file, which is provided with the groff
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distribution. The installation steps are summarised below:
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1. Change working directory to any suitable location where you may unpack
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the groff distribution; you must be authorized for write access.
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Approximately 30MB of free disk space are needed.
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2. Unpack the groff distribution:
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tar xzf <download-path>/groff-<version>.tar.gz
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This creates a new sub-directory, groff-<version>, containing an image of
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the groff source tree. You should now change directory, to make this
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./groff-<version> your working directory.
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3. If you are intending to build groff with support for HTML output, then
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you must now ensure that the prerequisites described in the later section
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PREREQUISITES FOR HTML OUTPUT are satisfied, before proceeding to build
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groff; in particular, please ensure that all required support programs
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are installed in the current PATH.
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4. You are now ready to configure, build, and install groff. This is
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accomplished using the conventional procedure, as described in the file
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INSTALL, i.e.
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./configure --prefix=<win32-install-path> ...
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make
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make install
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Please observe the syntax for the configure command, indicated above; the
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default value for --prefix is not suitable for use with MinGW, so the
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--prefix=<win32-install-path> option must be specified, where
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<win32-install-path> is the chosen MS-Windows directory in which the
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groff application files are to be installed (see the later section
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entitled CHOOSING AN INSTALLATION PATH). Any other desired configuration
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options may also be specified, as described in the standard groff
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installation instructions.
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5. After completing the above, groff should be successfully installed; the
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build directory is no longer required; it may be simply deleted in its
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entirety. Alternatively, you may choose to keep it, but to remove all
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files which can be reproduced later, by repeating the configure, make and
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make install steps; this is readily accomplished by the command
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make distclean
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This completes the installation of groff; please read the final sections of
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this file, GROFF RUNTIME ENVIRONMENT and CAVEATS AND BUGS, for advice on
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setting up the runtime environment, and avoiding known runtime problems,
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before running groff.
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CHOOSING AN INSTALLATION PATH
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-----------------------------
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It may be noted that the above instructions indicate that the ./configure
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command must be invoked with an argument specifying a preference for
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--prefix=<win32-install-path>, whereas the standard groff installation
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instructions indicate that this may be omitted, in which case it defaults to
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--prefix=/usr/local.
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In the case of building with MinGW, the default behaviour of configure is
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not appropriate for the following reasons.
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o The MSYS environment creates a virtual UNIX-like file system, with its
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root mapped to the actual MS-Windows directory where MSYS itself is
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installed; /usr is also mapped to this MSYS installation directory.
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o All of the MSYS tools, and the MinGW implementation of GCC, refer to files
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via this virtual file system representation; thus, if the
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--prefix=<win32-install-path> is not specified when groff is configured,
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`make install' causes groff to be installed in <MSYS-install-path>/local.
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o groff needs to know its own installation path, so that it can locate its
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own installed components. This information is compiled in, using the
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exact form specified with the --prefix=<win32-install-path> option to
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configure.
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o Knowledge of the MSYS virtual file system is not imparted to groff; it
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expects the compiled-in path to its components to be a fully qualified
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MS-Windows path name (although UNIX-style slashes are permitted, and
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preferred to the MS-Windows style backslashes, to demarcate the directory
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hierarchy). Thus, when configuring groff, if
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--prefix=<win32-install-path> is not correctly specified, then the
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installed groff application looks for its components in /usr/local, and
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most likely doesn't find them, because they are actually installed in
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<MSYS-install-path>/local.
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It is actually convenient, but by no means a requirement, to have groff
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installed in the /usr/local directory of the MSYS virtual file system; this
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makes it easy to invoke groff from the MSYS shell, since the virtual
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/usr/local/bin is normally added automatically to the PATH (the default
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PATH, as set in MSYS's /etc/profile), when MSYS is started.
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In order to install groff into MSYS's /usr/local directory, it is necessary
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to specify the fully qualified absolute MS-Windows path to this directory,
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when configuring groff, i.e.
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./configure --prefix=<MSYS-install-path>/local ...
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For example, on a system where MSYS is installed in the MS-Windows directory
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D:\MSYS\1.0, the MSYS virtual path /usr/local resolves to the absolute
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MS-Windows native path D:\MSYS\1.0\local (the /usr component of the MSYS
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virtual path does not appear in the resolved absolute native path name since
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MSYS maps this directly to the root of the MSYS virtual file system). Thus,
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the --prefix option should be specified to configure as
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./configure --prefix=D:/MSYS/1.0/local ...
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Note that the backslash characters, which appear in the native MS-Windows
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form of the path name, are replaced by UNIX-style slashes in the argument to
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configure; this is the preferred syntax.
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Also note that the MS-Windows device designator (D: in this instance) is
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prepended to the specified path, in the normal MS-Windows format, and that,
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since upper and lower case distinctions are ignored in MS-Windows path
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names, any combination of upper and lower case is acceptable.
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PREREQUISITES FOR HTML OUTPUT
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-----------------------------
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If you intend to use groff for production of HTML output, then there are a
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few dependencies which must be satisfied. Ideally, these should be resolved
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before attempting to configure and build groff, since the configuration
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script does check them.
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In order to produce HTML output, you first require a working implementation
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of Ghostscript; either the AFPL Ghostscript or the GNU Ghostscript
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implementation for MS-Windows should be suitable, depending on your
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licensing preference. It is highly recommended to use version 8.11 or
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higher due to bugs in older versions. These may be obtained, in the form of
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self-installing binary packages, by following the download links for the
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chosen licensing option, from http://sourceforge.net/projects/ghostscript.
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Please note that these packages install the Ghostscript interpreter required
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by groff in the ./bin subdirectory of the Ghostscript installation
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directory, with the name gswin32c.exe. However, groff expects this
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interpreter to be located in the system PATH, with the name gs.exe. Thus,
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to ensure that groff can correctly locate the Ghostscript interpreter, it is
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recommended that the file gswin32c.exe should be copied from the Ghostscript
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installation directory to the MSYS /usr/local/bin directory, where it should
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be renamed to gs.exe.
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In addition to a working Ghostscript interpreter, you also require several
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image manipulation utilities, all of which may be scavenged from various
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packages available from http://sourceforge.net/projects/gnuwin32, and which
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should be installed in the MSYS /usr/local/bin directory, or any other
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suitable directory which is specified in the PATH. These additional
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prerequisites are
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1. from the netpbm-<version>-bin.zip package:
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netpbm.dll
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pnmcrop.exe
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pnmcut.exe
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pnmtopng.exe
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pnmtops.exe
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2. from the libpng-<version>-bin.zip package:
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libpng.dll
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3. from the zlib-<version>-bin.zip package:
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zlib-1.dll, which must be renamed to zlib.dll
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4. from the psutils-<version>-bin.zip package:
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psselect.exe
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Note that it is not necessary to install the above four packages in their
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entirety; of course, you may do so if you wish.
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GROFF RUNTIME ENVIRONMENT
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-------------------------
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The runtime environment, provided to groff by MSYS, is essentially the same
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as would be provided under a UNIX or GNU/Linux operating system; thus, any
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environment variables which may be used to customize the groff runtime
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environment have similar effects under MSYS, as they would in UNIX or
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GNU/Linux, with the exception that any variable specifying a path should
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adopt the same syntax as a native MS-Windows PATH specification.
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There is, however, one known problem which is associated with the
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implementation of the MS-Windows file system, and the manner in which the
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Microsoft runtime library (which is used by the MinGW implementation of GCC)
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generates names for temporary files. This known problem arises when groff
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is invoked with a current working directory which refers to a network share,
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for which the user does not have write access in the root directory, and
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there is no environment variable set to define a writeable location for
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creating temporary files. When these conditions arise, groff fails with a
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`permission denied' error, as soon as it tries to create any temporary file.
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To specify the location for creating temporary files, the standard UNIX or
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GNU/Linux implementation of groff provides the GROFF_TMPDIR or TMPDIR
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environment variables, whereas MS-Windows applications generally use TMP or
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TEMP; furthermore, the MS-Windows implementations of Ghostscript apparently
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support the use of only TEMP or TMPDIR.
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To avoid problems with creation of temporary files, it is recommended that
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you ensure that both TMP and TEMP are defined, with identical values, to
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point to a suitable location for creating temporary files; many MS-Windows
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boxes have them set already, and groff has been adapted to honour them, when
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built in accordance with the preceding instructions, using MinGW.
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CAVEATS AND BUGS
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----------------
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There are two known issues, observed when running groff in the MinGW/MSYS
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environment, which would not affect groff in its native UNIX environment:
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o Running groff with the working directory set to a subdirectory of a
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network share, where the user does not have write permission in the root
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directory of the share, causes groff to fail with a `permission denied'
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exception, if the TMP environment variable is not appropriately defined;
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it may also be necessary to define the TEMP environment variable, to avoid
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a similar failure mode, when using the -Thtml output mode of groff. This
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problem is more fully discussed in the preceding section, GROFF RUNTIME
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ENVIRONMENT.
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o When running groff (or nroff) to process standard input, where the
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standard input stream is obtained directly from the RXVT console provided
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with MSYS, groff cannot detect the end-of-file condition for the standard
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input stream, and hangs. This appears to be caused by a fault in the MSYS
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implementation of RXVT; it may be worked around by either starting MSYS
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without RXVT (see the comments in the MSYS.BAT startup script); in this
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case standard input is terminated by typing <Ctrl-Z> followed by <RETURN>,
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on a new input line. Alternatively, if you prefer to use MSYS with RXVT,
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you can enter the interactive groff command in the form
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cat | groff ...
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in which case <Ctrl-D> terminates the standard input stream, in just the
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same way it does on a UNIX system; the cat executable provided with MSYS
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does seem to trap the end-of-file condition, and properly signals groff
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that the input stream has terminated.
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