+If you want to do some more serious cross-platform programming with wxWidgets,
+such as for GTK and Motif, you can now build two complete libraries and use
+them concurrently. For this end, you have to create a directory for each build
+of wxWidgets - you may also want to create different versions of wxWidgets
+and test them concurrently. Most typically, this would be a version configured
+with --enable-debug and one without.
+
+For building three versions (one GTK, one Motif and a debug version of the GTK
+source) you'd do this:
+
+mkdir buildmotif
+cd buildmotif
+../configure --with-motif
+make
+cd ..
+
+mkdir buildgtk
+cd buildgtk
+../configure --with-gtk
+make
+cd ..
+
+mkdir buildgtkd
+cd buildgtkd
+../configure --with-gtk --enable-debug
+make
+cd ..
+
+Note that since wxWidgets-2.6.0 you can install all those libraries
+concurrently, you just need to pass the appropriate flags when using them.
+
+* The simplest errors
+---------------------
+
+You get errors during compilation: The reason is that you probably have a
+broken compiler. GCC 2.8 and earlier versions and egcs are likely to cause
+problems due to incomplete support for C++ and optimisation bugs. Best to use
+GCC 2.95 or later.
+
+You get immediate segfault when starting any sample or application: This is
+either due to having compiled the library with different flags or options than
+your program - typically you might have the __WXDEBUG__ option set for the
+library but not for your program - or due to using a compiler with optimisation
+bugs.
+
+* The simplest program
+----------------------
+
+Now create your super-application myfoo.app and compile anywhere with
+
+g++ myfoo.cpp `wx-config --libs --cxxflags` -o myfoo
+
+* General
+---------
+
+The Unix variants of wxWidgets use GNU configure. If you have problems with
+your make use GNU make instead.
+
+If you have general problems with installation, see the wxWidgets website at
+
+ http://www.wxwidgets.org/
+
+for newest information. If you still don't have any success, please send a bug
+report to one of our mailing lists (see my homepage) INCLUDING A DESCRIPTION OF
+YOUR SYSTEM AND YOUR PROBLEM, SUCH AS YOUR VERSION OF MOTIF, WXMOTIF, WHAT
+DISTRIBUTION YOU USE AND WHAT ERROR WAS REPORTED. I know this has no effect,
+but I tried...
+
+* GUI libraries
+---------------
+
+wxWidgets/Motif requires the Motif library to be installed on your system. As
+an alternative, you may also use the free library "lesstif" which implements
+most of the Motif API without the licence restrictions of Motif.
+
+You can get the newest version of the Lesstif from the lesstif homepage at:
+
+ http://www.lesstif.org/
+
+* Additional libraries
+----------------------
+
+wxWidgets/Motif requires a thread library and X libraries known to work with
+threads. This is the case on all commercial Unix-Variants and all
+Linux-Versions that are based on glibc 2 except RedHat 5.0 which is broken in
+many aspects. As of writing this, virtually all Linux distributions have
+correct glibc 2 support.
+
+You can disable thread support by running
+
+./configure --disable-threads
+make
+su <type root password>
+make install
+ldconfig
+exit
+
+* Building wxMotif on OS/2
+--------------------------
+
+Please send comments and question about the OS/2 installation
+to Stefan Neis <Stefan.Neis@t-online.de> and patches to
+the wxWidgets mailing list.
+
+In the following list, the version numbers indicate the configuration that
+was actually used by myself, newer version should cause no problems and
+even older ones are expected to work most of the time.
+
+You'll need OS/2 Warp (4.51) or eCS(1.0), X-Free86/2 (3.3.6 or newer),
+Lesstif (0.92.7 or newer), emx (0.9d fix 4), a Unix like shell (pdksh-5.2.14
+or ash), Autoconf (2.57), GNU file utilities (3.13), GNU text utilities (1.19),
+GNU shell utilites (1.12), m4 (1.4), sed (2.05), grep (2.0), Awk (3.0.3),
+GNU Make (3.75).
+
+Preferably, you should have Posix/2 installed and C(PLUS)_INCLUDE_PATH and
+LIBRARY_PATH set up accordingly, however, wxGTK will even work without it.
+Presence of Posix/2 will be auto-detected.
+
+Open an OS/2 prompt and switch to the directory above.
+Set MAKESHELL or MAKE_SHELL (which one is needed depends on the version of
+make) to a Unix like shell, e.g.
+SET MAKESHELL=ash
+If you have a really deficient version of GNU make, it might even be
+necessary to set SHELL or even COMSPEC to a unix like shell as well.
+Depending on your installation you might want to also set INSTALL, for me
+it tends to try to use the system's tcpip\pcomos\install.exe which causes
+problems, e.g.
+SET INSTALL=<path_to_src_directory>/install-sh -c
+
+Notice that the delivered configure scripts are fully OS/2 aware, so you
+can simply run
+ ash -c "configure --with-motif"
+and make and possibly make install as described above.
+
+To verify Lesstif installation, configure will try to compile a
+sample program that requires X headers/libraries to be either
+available via C_INCLUDE_PATH and LIBRARY_PATH or you need to
+explicitly set CFLAGS prior to running configure.
+
+* Building wxMotif on SGI
+-------------------------
+
+Using the SGI native compilers, it is recommended that you
+also set CFLAGS and CXXFLAGS before running configure. These
+should be set to :
+
+CFLAGS="-mips3 -n32"
+CXXFLAGS="-mips3 -n32"
+
+This is essential if you want to use the resultant binaries
+on any other machine than the one it was compiled on. If you
+have a 64bit machine (Octane) you should also do this to ensure
+you don't accidently build the libraries as 64bit (which is
+untested).
+
+The SGI native compiler support has only been tested on Irix 6.5.
+
+* Building wxMotif on Cygwin
+----------------------------
+
+The normal build instructions should work fine on Cygwin. The one difference
+with Cygwin is that when using the "--enable-shared" configure option (which
+is the default) the API is exported explicitly using __declspec(dllexport)
+rather than all global symbols being available.
+
+This shouldn't make a difference using the library and should be a little
+more efficient. However if an export attribute has been missed somewhere you
+will see linking errors. If this happens then you can work around the
+problem by setting LDFLAGS=-Wl,--export-all-symbols. Please also let us know
+about it on the wx-dev mailing list.
+
+* Create your configuration
+---------------------------
+
+Usage:
+ ./configure [options]
+
+If you want to use system's C and C++ compiler,
+set environment variables CXX and CC as
+
+ % setenv CC cc
+ % setenv CXX CC
+ % ./configure options
+
+to see all the options please use:
+
+ ./configure --help
+
+The basic philosophy is that if you want to use different
+configurations, like a debug and a release version,
+or use the same source tree on different systems,
+you have only to change the environment variable OSTYPE.
+(Sadly this variable is not set by default on some systems
+in some shells - on SGI's for example). So you will have to
+set it there. This variable HAS to be set before starting
+configure, so that it knows which system it tries to
+configure for.
+
+Configure will complain if the system variable OSTYPE has
+not been defined. And Make in some circumstances as well...
+
+
+* General options
+-------------------
+
+Given below are the commands to change the default behaviour,
+i.e. if it says "--disable-threads" it means that threads
+are enabled by default.
+
+Many of the configure options have been thoroughly tested
+in wxWidgets snapshot 6, but not yet all (ODBC not).