The V C++ GUI Framework
Installation Guide

# General Installation Notes

I believe that V is one of the easiest to program GUI frameworks you will find. However, because it has been designed to work on several platforms, each with differing file systems and C++ compilers, getting a working version of V takes a little effort.

Please remember that V is a free package, and is being done completely by volunteers. I am paying for the ObjectCentral web site that is the home of V out of my own pocket. Supporting a program like V takes a lot of time and effort. Mostly I want to spend that effort on improving the library itself. Thus, my philosophy on distribution is to keep the number of downloadable files to a minimum. For the core (X LessTif and MS-Windows) distribution, I've chosen to use gzipped tar files. If you have Linux or other Unix flavor, this is the natural format. If you use MS-Windows, then you can use the popular WinZip program which supports .tgz files, or download Windows versions of tar and gunzip from the ObjectCentral ftp site.

The OS/2 and X gtk version are built by the volunteers that did those ports. I try to let them do what is easiest and best for them.

So, please take the time to read this section carefully. It should have the details you need to get a working version of V for almost any supported platform. If you think there would be a better way, I'd appreciate any volunteer effort you'd like to put into a more automated process, and I'll try to include them on the ObjectCentral web site. Now to the details...

There a bunch of download files available, and the exact file names and versions will vary over time. In order to simplify my life, I'm now distributing all files from the Download Central page of the Object Central web site. That page will always contain the latest version, as well as possible new files (such as precompiled libraries for different compilers) that might not be covered here.

Beginning with V Version 1.21, the V distribution will consist of several parts.

- Full source
  The complete source of the V Library for MS-Windows and X Windows will be found in `vsrc-1.xx.tar.gz`, a gzipped tar file suitable for either MS-Windows or X platforms such as Linux, where "xx" is the current version number. The full source contains all the source and the make files and project files normally needed to get V compiled on your machine. Use the standard Linux/Unix `gunzip` and `tar` programs to extract the file. MS-Windows versions of these are available on ObjectCentral ftp site. WinZip also will extract gzipped tar files.
- Documentation
  As of Version 1.21, the documentation is maintained only in html format. The latest version of the documentation is included in the full V distribution. A printable version using Adobe Acrobat PDF format is also available. The PDF version has been automatically generated from the HTML source, and is available via the download page.
- Binary distributions
  V has been designed to be easily installed on many platforms. This document describes some of the details you will need to know to install V on your system. This installation guide covers the distributions of V used by the most users. Some platforms are not explicitly covered, but there should be enough general information here to get you started.

  It has been my policy to distribute V only in source format, and not include precompiled versions of the library or applications. There are two reasons for this. First, there are a bunch of C++ compilers out there, and they usually don't work together. It would take just too much effort to try them all. Second, I think getting V to compile with your compiler on your system is a good exercise. If you can get that far, then you should be able to produce a V application with few problems.

  However, that said, beginning with Version 1.21, the distribution will also contain ready-to-use compiled versions of the library and V utility applications for the platforms and compilers I have easy access to. This is turning out to vary over time, and will change as I find time and compilers. Again, the latest versions can be found on the Download Central page of the Object Central web site.

  In general, I'm likely to support the MinGW gcc compiler, Borland GCC32 5.5, and Microsoft Visual C++ 6.0. There might be some Linux versions, as well. The binary versions will follow some weeks after the source code release! See the ObjectCentral ftp site for latest binary versions. Instructions for installation of the binary versions are included later in this page.

## General Installation Philosophy

I think it is appropriate to discuss my general philosophy about the distribution of V, and how Version 1.21 represented a major change. First, it is important to remember that the distribution of V is essentially a one person effort. The X Athena and Motif versions, and the Windows WIN32 versions, as well as the documentation, are currently completely being done by me, Bruce Wampler. The OS/2 is the responsibility of Jon Hacker, and the X gtk version has been done by Sven Verdoolaege (skimo). Thus, there are really three distributions of V.

Nevertheless, I'm still the main focal point of V, and am responsible for the main distribution, and approval of the other releases. Thus, some of the decisions about the distribution have been made to minimize the time I spend on distribution, and maximize the time I spend on adding features. Thus, I don't use an Install program on MS-Windows, and haven't RPM packaged V for Linux. I'd more than welcome any volunteers to do anything to make installation simpler.

Until the 1.21 release, V had been strictly a source code distribution. I've finally decided that is not the best decision. So, beginning with this version, I will provide precompiled binaries for several major compilers and platforms. (Note: the release of the binary versions will follow some time after the source release.) If you successfully build a version of V for one that I haven't provided, please let me know, and I will include your version on the distribution site.

Because of the history as a source only distribution, and because many V users will still have to compile it, this document will still be heavily oriented to telling you how to compile V on your system. If you are lucky enough to use a compiler supported by a binary distribution, then you are in good shape.

I've also been hesitant to consider V a major library on equal status with the standard C++ libraries. Again, I'm changing that idea, and beginning with V 1.21, the general philosophy will be to install V libraries, include files, and utility applications in the same directories used by X applications for X systems, and the main location of includes and libraries for MS-Windows. For most users, this will greatly simplify things. For some, it may mean an interaction with your system administrator to get V properly installed. I'd appreciate feedback on this new approach.

## Directory Structure

This section describes the directory structure of the V source distribution. The V directory structure has been designed to allow you to either install V in a personal directory, or at a higher system level.

The file hierarchy is:

/v
  The main V directory.

/v/appgen
  V application generator program.

/v/bccide
  MS-Windows build files for Borland C++.

/v/bccide/vdll
  MS-Windows build files for Borland C++ version of V DLL. This directory is obsolete as of V 1.24, but is included until someone provides something better.

/v/bin
  The `/bin` directory is used to hold the binaries of V sample programs during build time. No actual binaries are included on the distribution, but several subdirectories should be created when V is unpacked.

/v/bmp2vbm
  Source for a simple MS-Windows and OS/2 `.bmp` bitmap format to `.vbm` V bit map format converter.

/v/Configs
  Various make configuration files for Linux/Unix and MinGW/Cygwin versions.

/v/doc
  The V documentation. The documentation included in the distribution is in HTML.

/v/draw
  Source for the VDraw example program. Examples that are identical across platforms use a `.cpp` file extension.

/v/drawex
  Very simple V draw example from C/C++ Users Journal article.

/v/examp
  Source for a simple V example.

/v/gnuwin32
  Files that may be needed to compile and use V for the cygwin and gnuwin32 Windows compilers.

/v/iconed
  Source for V Icon editor.

/v/icons
  Source for a large number V vbm bitmaps useful for tool bars. If you compile the example program here, you can see all the icons available. A tool tip will pop up giving the file name of each icon.

/v/includew/v
  Source for the MS-Windows `*.h` V header files.

/v/includex/v
  Source for the X `*.h` V header files.

/v/lib
  Compiled version of the V library will be placed under appropriate subdirectories here during build.

/v/msvc6
  Project and make files for Microsoft VC++ 6.

/v/objx
  Compiled object code is saved under here.

/v/objdll
  Compiled object code for dll versions is saved under here.

/v/obj
  Compiled object code for Motif version is saved under here.

/v/refman
  The html documentation for V.

/v/srcwin
  The full C++ source for the Ms-Windows V library. The files use a `.cpp` extension.

/v/srcx
  The full C++ source for the X V library. Most files use a `.cxx` extension. Files with a `.cpp` extension are identical to their counterparts in the `/srcwin` directory.

/v/test
  The test program used to test V functionality.

/v/tutor
  The source code for the tutorial example.

/v/vide
  The source code for VIDE, the V Integrated Development Environment.

/v/vopengl
  Source for examples for V vBaseGLCanvasPane class that interfaces to OpenGL.

/v/watcom
  Project and make files for Watcom C++ compiler.

## Microsoft Windows

Believe it or not, all the object code generated by the various compilers available for Windows is incompatible across compilers! This means it is not easy to distribute V already compiled for every compiler available. For one thing, I just can't afford to buy that many compilers.

This incompatibility means two important things. First, you must use a library for V compiled with your compiler. I've tried to supply project or make files required for the major compilers, but not all are available. The binary distribution also has precompiled versions for several major Windows compilers.

Second, when you compile your apps for V, you must be very careful about the compilation model you specify. The WIN32 API does have some calling convention and data alignment problems. You MUST be careful to compile the V library AND your own applications using the calling conventions. These options are usually buried somewhere on an options menu. I can't provide exact information about this. It is your job to understand your compiler enough to do this.

I've selected a calling convention for the V project files I provide. You should check what they are, and be sure they match. I don't think they are always the default settings.

For example, the WIN32 version for the Borland compiler requires that `word` alignment be used. The compiler default is `byte`, so you will have to change this for your projects. The project examples supplied have generally had their options set as required. You should examine the settings, and use the same ones for your applications. You cannot mix compilers or even compiler code options.

It does seem, however, that you can build your applications with a data alignment bigger than V's. V is built with `word` alignment, but apparently it is ok to build your apps with `4 byte` or `8 byte` alignment and use it with the default `2 byte` V library.

The standard distribution includes subdirectories for each compiler: Borland (`/bccide`), Microsoft (`/msvc`,`/msvc6`), Watcom (`/watcom`), and MinGW (`/gnuwin32`). For the IDE based versions, you should be able to use the project files to get started. For the MinGW distribution, please see the section below on MinGW.

## General Instructions for Precompiled library

In general, I will try to provide precompiled libraries for Windows in a self-installing .EXE package. Simply run the distribution, and specify the main directory of your compiler.

The binaries are for the following compilers:

MinGW: This was compiled using the latest MinGW distribution.

Borland C++ BCC32 5.5 - This was build using the free 5.5 compiler.

### How to do it

The self-installer will allow you to use the standard `/bin`, `/include,` and `/lib` directories used by your compiler. The V utility programs (vappgen, vide, etc.) are actually compiled with the MinGW compiler, and should execute with any compiler. The V include files, which belong on `.../include/v` are also common across all Windows compilers.

At this point, V should behave like any other library and include file used by your compiler, and will be easy to use. So far, the only special thing V requires is at LEAST word alignment. We've had pretty reliable reports that using 2-word or 4-word alignment will also work for your apps, even with word V libraries.

## GNU g++ - MinGW

In my opinion, the best compiler available for Windows is the GNU g++ compiler. There are really two development environments that use the g++ compiler: gnuwin32 and MinGW. The first is really the Cygnus environment, and uses the `cygwin.dll` to support many Unix-like functions on windows. The MinGW distribution is intended for native Windows development.

I have been mostly using the MinGW version to develop V for quite some time now. The latest version is GCC 2.95.2, which combines the egcs and standard 2.8 gcc compiler. See www.mingw.org for the latest info on the MinGW compiler. Please be sure you are using the latest version of the compiler!

### How to compile your own Applications

After you have a working version of V built (and probably installed on the MinGW directory path), either by installing the precompiled version or building your own version, it is fairly easy to use and include the V library. The main thing is to use the required `-l` switches to g++ to load the proper libraries. Use:
`g++ $(YOUROBJECTS) -lV -lcomctl32 -mwindows`
-or, for OpenGL apps-
`g++ $(YOUROBJECTS) -lV -lVgl -lcomctl32 -mwindows`
All the libraries needed for Windows are automatically included with the option `-mwindows` (you may also need to add `-lcomctl32`).

If you want to add icon resources, see the example vgen.rc file in the /v/appgen directory. You can replace the .ico file with whatever icon you want. You then need to add a dependency in your Makefile to compile the .rc file with windres, and include the resulting output file on the link line. The Makefile for vgen in /v/appgen includes an example of how to do this.

### Instructions for rebuilding V for MinGW

1. Unzip the V Windows distribution. You must be sure to use an unzipper that preserves file case, or manually rename all the files to use lower case. While Windows doesn't care, gnu make does.
2. You must now create the proper version of /v/Config.mk. Usually, this is a matter of copying the proper version of Config.Mk from the /v/Configs directory. For the MinGW version, the file to copy is /v/Configs/CfgMing.mk. Copy it to /v/Config.mk.

   The default version assumes that you have unpacked the V distribution to c:/v, and that you have installed MinGW on C:/mingw. You can change this by editing the copied version of /v/Config.mk.

3. The Makefile in the /V root directory is intended for use on Unix/Linux machines. It does NOT work for Windows. However, the Makefiles on the directories with the V library and other V applications do work on Windows, and are used for both the X version on Linux/Unix, and for the MS-Windows GNU WIN32 versions.

   You will add -lcomctl32 to your link lines in your makefile.

   Also, if you choose to compile for OpenGL, you may need to copy the entire gl subdirectory (found at v/gnuwin32/include) to the GNU WIN32 include directory (as a /include/gl subdirectory).

4. cd to each of these directories and run `make' for each of the following. (The top level Makefile in C:/v has X specific stuff and doesn't work. Also, since make is case sensitive, you might have to use `make -f makefile'.)
     srcwin (required)
     appgen (useful - see documentation)
     iconed (useful - especially for icons)
     icons (shows predefined V icons you can use)
     draw (example only)
     drawex (example only)
     texted (example only)
     tutor (example only)
     vide (very useful IDE for MinGW!)
5. Putting the V headers in the MinGW directory path has the advantage of eliminating the need for extra include directives in your makefiles.

   After you build V, you will find it easiest to copy libV.a from v/lib to mingw/lib/libV.a, as well as all the V headers in from v/includew/v to mingw/include/v. This will allow you to easily update versions of V, and to compile your own applications with V.

   To do this, after you've built the V library, change to the home /v directory, and enter:

     `make installgnuwin32`
     This will copy all the required header, library, and binary files to the mingw directories as defined in Config.mk.
6. If you want to build OpenGL applications with MinGW, the header files are located at gnuwin32/include.

## Cygnus cygwin

### Instructions for rebuilding V for Cygwin B20

One of the main features of the Cygwin support for the V library is the fact that it may be built for both X and Windows GUI targets.

NOTE: To use the X version you will have to download precompiled library and header files of X11R6.4 from Cygwin32 Porting Project's homepage at http://www-public.rz.uni-duesseldorf.de/~tolj, which is also the official supporter and a X windows server for your Win32 machine, i.e. X-Win32 from http://www.starnet.com.

#### TO REBUILD THE V LIBRARY (X and WINDOWS) FOR CYGWIN32

1. To extract the compressed v-1.xx.tar.gz archive you will have to do the following within your bash shell:
   `
     gunzip v-1.xx.tar.gz
     tar xf v-1.xx.tar
   `
   Now you will have the V distribution within the subdirectory v/.
2. You will have to build either the X or the Windows version of V for Cygwin. You can build both, but you will have to build each separately, and copy the include and lib files after each build. Note that the X version uses the v/includex/v include files, while the MS-Windows version uses /v/includew/v files. It is not particularly easy to use both the X and Windows V libraries at the same time.
3. Making the X version: Copy /v/Configs/CfgCygX.mk to /v/Config.mk, and edit it as follows:
     - set HOMEV to the home directory of your V distribution
     - set X11RV = X11R6.4 (if using our recommended X11 libraries)
     - Now you may type "make" and build the library and some example applications.
4. Making the Windows GUI version: Copy /v/Configs/CfgCygW.mk to /v/Config.mk and edit that file as follows
     - set HOMEV to the home directory of your V distribution

5. cd to each of these directories and run "make" for each of the following. (Don't use the top level Makefile in /v since this is used to build the X version).
     srcwin (required)
     appgen (useful - see documentation)
     iconed (useful - especially for icons)
     icons (shows predefined V icons you can use)
     test (tests V lib - not usually needed)
     bmp2vbm (not needed, functionality now included in iconed)
     draw (example only)
     drawex (example only)
     examp (example only)
     texted (example only)
     tutor (example only)
     vide (very useful IDE for cygwin32!)
6. If you want to build OpenGL applications with cygwin32, the header files are located at gnuwin32/include.

#### TO COMPILE YOUR OWN APPLICATIONS

Now that you have a working version of V built (and probably installed on the cygwin\bin directory path), it is fairly easy to use and include the V library. The main thing is to include the required -l switches to g++ to load the proper libraries. Use:
`g++ $(YOUROBJECTS) -s -e _mainCRTStartup -lV -lcomctl32 -mwindows`

A similar model line for using the X version of the V library is:
`g++ $(YOUROBJECTS) -s -e _mainCRTStartup -L/usr/X11R6.4/lib -lV -lXaw -lXmu -lXt -lXext -lX11 -lICE -lSM`

All the libraries needed for Windows are automatically included with the option -mwindows (you may need to add -lcomctl32).

If you want to avoid using the Cygwin DLL, you can also add the -no-cygwin switch, and link to the MinGW libraries. See the Cygwin documentation for more info. Also check out Mumit Kahn's info.

If you want to add icon resources, see the example vgen.rc file in the /v/appgen directory. You can replace the .ico file with whatever icon you want. You then need to add a dependency in your Makefile to compile the .rc file with windres, and include the resulting output file on the link line. The Makefile for vgen in /v/appgen includes an example of how to do this.

Please read the file /v/Configs/cygnus-readme.txt for the latest info on compiling V with Cygwin.

## Borland

As of V Version 1.24, support for Borland 5.0 is no longer updated. If some kind Borland user updates these files, I'll add update them. As it stands, you can probably adapt the following instructions to get V 1.24 to compile with Borland 5.0.

Windows specific files for Borland 5.0 are kept on BCCIDE. That directory includes .IDE files for Borland C++, .RC, .DEF, and .ICO files. The project files assume that BCC is on drive C:. If you have BCC 4.5, or keep BCC on a drive other than C:, then you will have modify the project files to change the include file search paths. Note that the BCC 5.0 project files only work for WIN32. V will no longer be supported for 16 bit compilers.

The subdirectory `/v/bccide/vdll` contains Borland makefiles for building a DLL version with Borland C++. It is VERY easy. See the Readme.txt file. You use the provided makefiles using a DOS window. Simply change to this directory, and run Borland's make on the Makefile in this directory. When you are done, you will have V122BCC.DLL (the DLL), and V122BCC.LIB (the load library).

Now you can build V applications using Borland C++, and link to the V122BCC.LIB, and include the V122BCC.DLL in the same directory as your executable.

## Microsoft Visual C++

This distribution now includes make/project files for Microsoft VC++. There are two versions: for MSVC 4.0, which were built using the cheap Standard Edition, and can be used with MSVC 5.0 as well; and MSVC 6.0.

Beginning with VC++ 6.0, Microsoft has done things to their C++ compiler that makes it really have trouble with the existing V code. The main obnoxious thing they've done is revert to old style handling of loop variables. I've had to change a bunch of code to allow default settings to be used.

The following are some of the things required to get V to compile with MSVC++ 6.0 (These notes are based on using the Standard Edition. They could be different for the Professional versions. I don't claim to be an MSVC++ expert, and any better usage notes would be appreciated.)

- The example workspace files assume V is found at `C:\V`. The following notes assume the same. Change references to `C:\V` to wherever you've installed V.
- You will generally create a new, blank workspace for your projects.
- To enable the compiler to find V header files, add `C:\v\includew` under Additional include directories under the C/C++ tab of the Project Settings dialog.
- One way for the linker to find the V library is to add `vlib.lib` as the first file in the Object/library modules item of the Link tab of the settings dialog. You then need to add `C:\v\msvc6\vlib\release` (or whereever you've built the V library) to the Additional library path item. You can specify separate paths for debug and release versions of the V library if you need to, or simply use the release version for the "All Configurations" settings. There might be easier ways to specify how to use the V library, but this way worked for me.
- Important: You must add `comctl32.lib` to the Object/library modules list in the Link tab of the settings dialog. You can add this to the "All Configurations" settings if you wish.
- If when you try to build the `.exe` of your project you get messages about incompatible library uses, add the names of the libraries listed to the Ignore libraries: item of the Link tab of the Project Settings dialog.

## Watcom

The WATCOM C++ compiler is no longer supported. You really should try VIDE + MinGW!

## Other Compilers

If you want to compile V with a different compiler, it isn't too hard. To build the library, you include ALL the files in the `v/srcwin` directory. Specify `v/includew` in the include search path. V has been designed to work only with the LARGE model for Win3.1. It works with whatever calling convention you need for WIN32.

The djcpp version has difficulty compiling V. It was never intended to compile Win32 apps, and so V will not easily compile with djcpp.

## X Windows

Building V for various X Windows flavors of Unix system uses the standard gnu version of the Unix `make` tool. (Note: you must use a `make` compatible with the gnu version of `make`. The V makefiles use features and conventions supported by the gnu version. Some native `makes` do not support all the features, and will generate error messages.) The main `/v` directory contains a `Makefile` and a file called `Config.mk`. The directory `/v/Configs` contains several versions of `Config.mk` that usually must be customized to build V for your system. The `Makefile` and the `Config.mk` files contain more information about building V.

Beginning with V Version 1.25, the main X widget set supported is Open Motif. This version is free or available prebuilt for next to nothing for most X systems. (Try a web search for OpenMotif. RPM packages are available at redhat.com, as well. V will work with Motif 1.2 or 2.1.) Other commercial versions of Motif, as well as LessTif will no longer be tested with V, although they should continue to work. (V 1.27 was tested with the latest LessTif, and worked.)

Until 1.22, the Athena widget set had been the main one. V will continue to run under Athena, but it is likely that not all new features will be supported under Athena (e.g., multiple-list selection when that is added). Please see the section Motif vs. Athena below.

## Linux

### Instructions for building V for Linux

1. Gunzip and tar the V distribution to a directory of your choice. The files will extract to a `/v` subdirectory.
2. You must now create the proper version of /v/Config.mk. Usually, this is a matter of copying the proper version of Config.mk from the /v/Configs directory. This will be ConfigX.mk for the X Athena version, or ConfigM.mk for the Open Motif version. (Use ConfigM.mk if you have Motif.)

   The default version assumes that you have unpacked the V distribution to `$(HOME)/v`, where `HOME` is the standard environment variable. You can change this by editing the copied version of /v/Config.mk.

3. From the main `/v` directory, run `make'. This should build the static version V library and all the V utility applications. (You can build a shared library version -- see the comments in the Makefile.) The following utilities are built:
     appgen (useful - see documentation)
     iconed (useful - especially for icons)
     icons (shows predefined V icons you can use)
     draw (example only)
     drawex (example only)
     examp (example only)
     texted (example only)
     tutor (example only)
     vide (very useful IDE)
4. By default, the V makefile will try to compile the OpenGL library. If you don't have OpenGL or Mesa installed on your system, the makefile will generate a bunch of errors about missing OpenGL include files, and you can safely ignore them.
5. After you build V, you will find it easiest to install the library and include files to standard places. To do this, first `su` or logon as `root`. Then enter `make installLinux`. This will install V to the standard X11 directories.

### How to compile your own Applications

After you have a working version of V built (and probably installed), either by installing the precompiled version or building your own version, it is fairly easy to use and include the V library. The V application generator, `vgen`, will build a makefile with the proper includes and library switches. You can also use the provided sample makefiles as starting points.

You can also build your own makefiles. The main thing is to use the required `-l, -L, and -I` switches to g++ to load the proper libraries and include files. To compile, use:
`g++ $(YOURSRC) -I/usr/X11R6/include`
To link, use for OpenM otif:
`g++ $(YOUROBJECTS) -L/usr/X11R6/lib -lV -lXm -lXp -lXt -lXext -lX11`
or for Athena
`g++ $(YOUROBJECTS) -L/usr/X11R6/lib -lV -lXaw -lXmu -lXt -lXext -lX11`
For OpenGL applications, add `-lVgl -lGLw -lGLU -lGL` to the library switches.

Note that LessTif and other commercial versions of Motif may require different library switches.

## Other Unix Flavors

A series of `Makefiles` is included with the V distribution to build the library on various Unix systems. In the main `/v` directory is a file called `Config.mk` which usually needs to be customized before building. The prototype `Config.mk` files are contained in the subdirectory `/v/Configs`. There are two versions of `Config.mk` supplied: `ConfigX.mk` for the Athena widget based version, and `ConfigM.mk` for the Motif widget based version. Before you compile, you should copy the appropriate file to `/v/Config.mk`, edit it to customize it for your system, then type `make` from the `/v` directory. This will build the V library and all the utility programs.

The `Config.mk` file, and the various `Makefiles` contain lots of comments about building V on your platform. Please read those files directly for more critical information about getting V working on your system.

## gtk

The gtk version of V is still a separate distribution. Please see the instructions included with it. It will eventually become the mainline V Linux distribution.

## Motif vs. Athena

Beginning with V 1.25, Open Motif will become the standard widget set supported by V. V may continue to work with LessTif or other commercial Motif versions, but the latest free Open Motif works reliably.

## OS/2

Directions for compiling on OS/2 are included in the OS/2 distribution. Since the OS/2 version was just released, there are not as many prebuilt project or makefiles available. The MinGW files should serve as a good basis for the EMX compiler. As users contribute feedback, this situation should change.

## OpenGL

V will only work with OpenGL if you have it installed on your system. Beginning with V 1.21, OpenGL support has been split into a separate library file. This may cause some compilation errors from V makefiles if you don't have OpenGL, but you can ignore them.

## OpenGL on Microsoft Windows

Windows comes standard with the OpenGL DLL. You must have the appropriate import library to use the DLL, which usually comes with the various compilers. The only problem seems to be with the gnu MinGW/Cygwin compiler. The required include files are available under the `/v/gnuwin32` directory if you need them.

## OpenGL on X Windows

V seems to work flawlessly with Mesa on Linux, and with standard OpenGL on most other systems. Note the V requires the GLw Motif/Athena widget library. GLw is often installed on Linux systems by default, but it has not been included on many late Linux releases. To get around this issue, you can build support for GLw right into libVgl.a by an appropirate definition in the Config.mk file.

If you don't have OpenGL or Mesa, you won't need libVgl.a.

This user guide, installation, and reference manual, The V C++ GUI Framework User Guide and Reference Manual may be reproduced and distributed, in whole or in part, subject to the following conditions:

1. The copyright notice above and this permission notice must be preserved complete on all complete or partial copies.
2. You may not translate or create a derivative of this work without the author's written permission.
3. If you distribute this manual in part, you must provide instructions and a means for obtaining a complete version.
4. You may make a profit on copies of this work only if it is included as part of an electronic distribution of other free software works (e.g., Linux or GNU).
5. Small portions may be reproduced as illustrations for reviews or quotations in other works without this permission notice if proper citation is given.

My goal is to get as many people as can be helped using V. If the terms of this documentation copyright are unsatisfactory, please contact me and we can probably work something out.

V User Guide and Reference Manual - Version 1.27 - 15Jan2002
Copyright © 1998-2002, Bruce E. Wampler
All rights reserved.

Bruce E. Wampler
bruce@objectcentral.com
www.objectcentral.com