This file documents the installation of Octave.

   Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation.

   *Note:* This file is automatically generated from
`doc/interpreter/install.txi' in the Octave sources, so to make changes
to this documentation file, change that source file.

1 Installing Octave
*******************

   Here is the procedure for installing Octave from scratch on a Unix
system.

   * Run the shell script `configure'.  This will determine the features
     your system has (or doesn't have) and create a file named
     `Makefile' from each of the files named `Makefile.in'.

     Here is a summary of the configure options that are most
     frequently used when building Octave:

    `--prefix=PREFIX'
          Install Octave in subdirectories below PREFIX.  The default
          value of PREFIX is `/usr/local'.

    `--srcdir=DIR'
          Look for Octave sources in the directory DIR.

    `--enable-bounds-check'
          Enable bounds checking for indexing operators in the internal
          array classes.  This option is primarily used for debugging
          Octave.  Building Octave with this option has a negative
          impact on performance and is not recommended for general use.

    `--enable-64'
          This is an *experimental* option to enable Octave to use
          64-bit integers for array dimensions and indexing on 64-bit
          platforms.  You probably don't want to use this option unless
          you know what you are doing.

          If you use `--enable-64', you must ensure that your Fortran
          compiler generates code with 8 byte signed `INTEGER' values,
          and that your BLAS and LAPACK libraries are compiled to use 8
          byte signed integers for array dimensions and indexing.

    `--enable-shared'
          Create shared libraries (this is the default).  If you are
          planning to use the dynamic loading features, you will
          probably want to use this option.  It will make your `.oct'
          files much smaller and on some systems it may be necessary to
          build shared libraries in order to use dynamically linked
          functions.

          You may also want to build a shared version of `libstdc++',
          if your system doesn't already have one.

    `--enable-dl'
          Use `dlopen' and friends to make Octave capable of dynamically
          linking externally compiled functions (this is the default if
          `--enable-shared' is specified).  This option only works on
          systems that actually have these functions.  If you plan on
          using this feature, you should probably also use
          `--enable-shared' to reduce the size of your `.oct' files.

    `--without-blas'
          Compile and use the generic BLAS and LAPACK versions included
          with Octave.  By default, configure first looks for BLAS and
          LAPACK matrix libraries on your system, including optimized
          BLAS implementations such as the free ATLAS 3.0, as well as
          vendor-tuned libraries.  (The use of an optimized BLAS will
          generally result in several-times faster matrix operations.)
          Only use this option if your system has BLAS/LAPACK libraries
          that cause problems for some reason.  You can also use
          `--with-blas=lib' to specify a particular BLAS library
          `-llib' that configure doesn't check for automatically.

    `--without-ccolamd'
          Don't use CCOLAMD, disable some sparse matrix functionality.

    `--without-colamd'
          Don't use COLAMD, disable some sparse matrix functionality.

    `--without-curl'
          Don't use the cURL, disable the `urlread' and `urlwrite'
          functions.

    `--without-cxsparse'
          Don't use CXSPARSE, disable some sparse matrix functionality.

    `--without-umfpack'
          Don't use UMFPACK, disable some sparse matrix functionality.

    `--without-fftw'
          Use the included fftpack library instead of the FFTW library.

    `--without-glpk'
          Don't use the GLPK library for linear programming.

    `--without-hdf5'
          Don't use the HDF5 library for reading and writing HDF5 files.

    `--without-zlib'
          Don't use the zlib library, disable data file compression and
          support for recent MAT file formats.

    `--without-lapack'
          Compile and use the generic BLAS and LAPACK versions included
          with Octave.  By default, configure first looks for BLAS and
          LAPACK matrix libraries on your system, including optimized
          BLAS implementations such as the free ATLAS 3.0, as well as
          vendor-tuned libraries.  (The use of an optimized BLAS will
          generally result in several-times faster matrix operations.)
          Only use this option if your system has BLAS/LAPACK libraries
          that cause problems for some reason.  You can also use
          `--with-blas=lib' to specify a particular BLAS library
          `-llib' that configure doesn't check for automatically.

    `--help'
          Print a summary of the options recognized by the configure
          script.

     See the file `INSTALL' for more information about the command line
     options used by configure.  That file also contains instructions
     for compiling in a directory other than where the source is
     located.

   * Run make.

     You will need a recent version of GNU Make.  Modifying Octave's
     makefiles to work with other make programs is probably not worth
     your time.  We recommend you get and compile GNU Make instead.

     For plotting, you will need to have gnuplot installed on your
     system.  Gnuplot is a command-driven interactive function plotting
     program.  Gnuplot is copyrighted, but freely distributable.  The
     `gnu' in gnuplot is a coincidence--it is not related to the GNU
     project or the FSF in any but the most peripheral sense.

     To compile Octave, you will need a recent version of GNU Make.
     You will also need a recent version of `g++' or other ANSI C++
     compiler. You will also need a Fortran 77 compiler or `f2c'.  If
     you use `f2c', you will need a script like `fort77' that works
     like a normal Fortran compiler by combining `f2c' with your C
     compiler in a single script.

     If you plan to modify the parser you will also need GNU `bison' and
     `flex'.  If you modify the documentation, you will need GNU
     Texinfo, along with the patch for the `makeinfo' program that is
     distributed with Octave.

     GNU Make, `gcc', and `libstdc++', `gnuplot', `bison', `flex', and
     Texinfo are all available from many anonymous ftp archives.  The
     primary site is `ftp.gnu.org', but it is often very busy.  A list
     of sites that mirror the software on `ftp.gnu.org' is available by
     anonymous ftp from `ftp://ftp.gnu.org/pub/gnu/GNUinfo/FTP'.

     You will need about 925 megabytes of disk storage to work with when
     building Octave from source (considerably less if you don't
     compile with debugging symbols).  To do that, use the command

          make CFLAGS=-O CXXFLAGS=-O LDFLAGS=

     instead of just `make'.

   * If you encounter errors while compiling Octave, first check the
     list of known problems below to see if there is a workaround or
     solution for your problem.  If not, see the file BUGS for
     information about how to report bugs.

   * Once you have successfully compiled Octave, run `make install'.

     This will install a copy of octave, its libraries, and its
     documentation in the destination directory.  As distributed,
     Octave is installed in the following directories.  In the table
     below, PREFIX defaults to `/usr/local', VERSION stands for the
     current version number of the interpreter, and ARCH is the type of
     computer on which Octave is installed (for example,
     `i586-unknown-gnu').

    `PREFIX/bin'
          Octave and other binaries that people will want to run
          directly.

    `PREFIX/lib'
          Libraries like libcruft.a and liboctave.a.

    `PREFIX/share'
          Architecture-independent data files.

    `PREFIX/include/octave'
          Include files distributed with Octave.

    `PREFIX/man/man1'
          Unix-style man pages describing Octave.

    `PREFIX/info'
          Info files describing Octave.

    `PREFIX/share/octave/VERSION/m'
          Function files distributed with Octave.  This includes the
          Octave version, so that multiple versions of Octave may be
          installed at the same time.

    `PREFIX/lib/octave/VERSION/exec/ARCH'
          Executables to be run by Octave rather than the user.

    `PREFIX/lib/octave/VERSION/oct/ARCH'
          Object files that will be dynamically loaded.

    `PREFIX/share/octave/VERSION/imagelib'
          Image files that are distributed with Octave.

1.1 Installation Problems
=========================

This section contains a list of problems (and some apparent problems
that don't really mean anything is wrong) that may show up during
installation of Octave.

   * On some SCO systems, `info' fails to compile if `HAVE_TERMIOS_H'
     is defined in `config.h'.  Simply removing the definition from
     `info/config.h' should allow it to compile.

   * If `configure' finds `dlopen', `dlsym', `dlclose', and `dlerror',
     but not the header file `dlfcn.h', you need to find the source for
     the header file and install it in the directory `usr/include'.
     This is reportedly a problem with Slackware 3.1.  For Linux/GNU
     systems, the source for `dlfcn.h' is in the `ldso' package.

   * Building `.oct' files doesn't work.

     You should probably have a shared version of `libstdc++'.  A patch
     is needed to build shared versions of version 2.7.2 of `libstdc++'
     on the HP-PA architecture.  You can find the patch at
     `ftp://ftp.cygnus.com/pub/g++/libg++-2.7.2-hppa-gcc-fix'.

   * On some alpha systems there may be a problem with the `libdxml'
     library, resulting in floating point errors and/or segmentation
     faults in the linear algebra routines called by Octave.  If you
     encounter such problems, then you should modify the configure
     script so that `SPECIAL_MATH_LIB' is not set to `-ldxml'.

   * On FreeBSD systems Octave may hang while initializing some internal
     constants.  The fix appears to be to use

          options      GPL_MATH_EMULATE

     rather than

          options      MATH_EMULATE

     in the kernel configuration files (typically found in the directory
     `/sys/i386/conf'.  After making this change, you'll need to rebuild
     the kernel, install it, and reboot.

   * If you encounter errors like

          passing `void (*)()' as argument 2 of
            `octave_set_signal_handler(int, void (*)(int))'

     or

          warning: ANSI C++ prohibits conversion from `(int)'
                   to `(...)'

     while compiling `sighandlers.cc', you may need to edit some files
     in the `gcc' include subdirectory to add proper prototypes for
     functions there.  For example, Ultrix 4.2 needs proper
     declarations for the `signal' function and the `SIG_IGN' macro in
     the file `signal.h'.

     On some systems the `SIG_IGN' macro is defined to be something like
     this:

          #define  SIG_IGN  (void (*)())1

     when it should really be something like:

          #define  SIG_IGN  (void (*)(int))1

     to match the prototype declaration for the `signal' function.  This
     change should also be made for the `SIG_DFL' and `SIG_ERR'
     symbols. It may be necessary to change the definitions in
     `sys/signal.h' as well.

     The `gcc' `fixincludes' and `fixproto' scripts should probably fix
     these problems when `gcc' installs its modified set of header
     files, but I don't think that's been done yet.

     *You should not change the files in `/usr/include'*.  You can find
     the `gcc' include directory tree by running the command

          gcc -print-libgcc-file-name

     The directory of `gcc' include files normally begins in the same
     directory that contains the file `libgcc.a'.

   * Some of the Fortran subroutines may fail to compile with older
     versions of the Sun Fortran compiler.  If you get errors like

          zgemm.f:
          	zgemm:
          warning: unexpected parent of complex expression subtree
          zgemm.f, line 245: warning: unexpected parent of complex
            expression subtree
          warning: unexpected parent of complex expression subtree
          zgemm.f, line 304: warning: unexpected parent of complex
            expression subtree
          warning: unexpected parent of complex expression subtree
          zgemm.f, line 327: warning: unexpected parent of complex
            expression subtree
          pcc_binval: missing IR_CONV in complex op
          make[2]: *** [zgemm.o] Error 1

     when compiling the Fortran subroutines in the `libcruft'
     subdirectory, you should either upgrade your compiler or try
     compiling with optimization turned off.

   * On NeXT systems, if you get errors like this:

          /usr/tmp/cc007458.s:unknown:Undefined local
                symbol LBB7656
          /usr/tmp/cc007458.s:unknown:Undefined local
                symbol LBE7656

     when compiling `Array.cc' and `Matrix.cc', try recompiling these
     files without `-g'.

   * Some people have reported that calls to shell_cmd and the pager do
     not work on SunOS systems.  This is apparently due to having
     `G_HAVE_SYS_WAIT' defined to be 0 instead of 1 when compiling
     `libg++'.

   * On NeXT systems, linking to `libsys_s.a' may fail to resolve the
     following functions

          _tcgetattr
          _tcsetattr
          _tcflow

     which are part of `libposix.a'.  Unfortunately, linking Octave with
     `-posix' results in the following undefined symbols.

          .destructors_used
          .constructors_used
          _objc_msgSend
          _NXGetDefaultValue
          _NXRegisterDefaults
          .objc_class_name_NXStringTable
          .objc_class_name_NXBundle

     One kluge around this problem is to extract `termios.o' from
     `libposix.a', put it in Octave's `src' directory, and add it to
     the list of files to link together in the makefile.  Suggestions
     for better ways to solve this problem are welcome!

   * If Octave crashes immediately with a floating point exception, it
     is likely that it is failing to initialize the IEEE floating point
     values for infinity and NaN.

     If your system actually does support IEEE arithmetic, you should
     be able to fix this problem by modifying the function
     `octave_ieee_init' in the file `lo-ieee.cc' to correctly
     initialize Octave's internal infinity and NaN variables.

     If your system does not support IEEE arithmetic but Octave's
     configure script incorrectly determined that it does, you can work
     around the problem by editing the file `config.h' to not define
     `HAVE_ISINF', `HAVE_FINITE', and `HAVE_ISNAN'.

     In any case, please report this as a bug since it might be
     possible to modify Octave's configuration script to automatically
     determine the proper thing to do.

   * If Octave is unable to find a header file because it is installed
     in a location that is not normally searched by the compiler, you
     can add the directory to the include search path by specifying
     (for example) `CPPFLAGS=-I/some/nonstandard/directory' as an
     argument to `configure'.  Other variables that can be specified
     this way are `CFLAGS', `CXXFLAGS', `FFLAGS', and `LDFLAGS'.
     Passing them as options to the configure script also records them
     in the `config.status' file.  By default, `CPPFLAGS' and `LDFLAGS'
     are empty, `CFLAGS' and `CXXFLAGS' are set to `"-g -O"' and
     `FFLAGS' is set to `"-O"'.


