This is release 1.2.0 of the Fortran interface 
to the GNU Scientific Library. 
It is based on version 2.3 of GSL, and should not be used with earlier GSL releases.
Please use the release 1.0.0 in combination with GSL 1.x
Please use the release 1.1.0 in combination with GSL 2.1 or 2.2.1

Please consult the NEWS file for a change log.

License:
~~~~~~~~

FGSL is released under Version 2 or later of the GPL.

Installation procedure:
~~~~~~~~~~~~~~~~~~~~~~~

(A) prerequisites:

 1. An installation of GSL libraries and include files.
    Note that newer distributions may put libraries and 
    includes into different packages e.g., gsl and gsl-devel.
    For building FGSL, both must be installed.
 2. The ANSI C compiler used to build the GSL installation
 3. A Fortran 2003 compiler.

(B) autoconf setup:
This section applies only if you have downloaded the github
repository. Use of autoconf version 2.69 or higher and m4 1.4.16 or 
higher is recommended. Generate the configure script with
mkdir m4
autoreconf -i
After updating the same repository it may be necessary to issue
autoreconf
(without an additional option)

(C) build procedure:
this has changed due to introduction of an autoconf based system
(thanks to Tom Schoonjans for contributing this)

export FC=<fortran compiler command>
export FCFLAGS=<additional Fortran flags>
export gsl_LIBS=<gsl library link line>
export PKG_CONFIG_PATH=<directory in which gsl.pc resides>
./configure
    If you have to explicitly select which Fortran compiler is
    supposed to be used, add the following option to the configure script:
    FC=<my_fortran_compiler>
    Furthermore, the configure script allows the user to enable several
    options, such as --prefix=<my_installation_location>

    For a list of all available options run:
    ./configure --help

    NOTE: for supporting different compilers with a single GSL 
    installation it is recommended to specify the following

    ./configure --prefix=<path to gsl install> \
                --libdir=<path to gsl install>/lib/$FC \
                --includedir=<path to gsl install>/include/$FC
  
  

make
    Builds the module information file and static as well
    as shared libraries.
    Testing can be performed by doing

make check
    which runs a number of tests. Please check for failures and
    report to the indicated mail address.    
    For a debug version of the library using a debug build of GSL
    is recommended. Furthermore, if the GSL installation contains 
    shared libraries, you may need add an entry to LD_LIBRARY_PATH
    pointing to the lib subdirectory of the GSL installation before
    running the tests. If you use GSL static libraries, these 
    probably require to be built with -fPIC, otherwise libtool
    will probably fail to link your executables.

make install
    this installs the library as well as the documentation into 
    /usr/local or, if specified, the prefix path. 

make dist (or make distcheck)

    Generate distribution tarballs. The latter is preferred (but it 
    takes much longer), since it will also make sure everything builds 
    correctly and the examples run, as well as verify if no files are 
    left after make clean and make uninstall.


(D) usage:

It is recommended that you obtain the necessary flags to compile with FGSL support
through pkg-config:

$F90 -o myprog.exe `pkg-config --cflags fgsl` myprog.f90 \
	`pkg-config --libs fgsl`

Alternatively, libtool can also be used to link the executables.

Reporting Bugs etc.
~~~~~~~~~~~~~~~~~~~

Patches and/or bug reports are very welcome and can be directed
to Bader_at_lrz_dot_de

Suggestions for implementations of missing bits will be worked
on as time allows. 

Releases:

  * 0.5: End of March, 2007 (revision 1636)
  * 0.6: End of April, 2007 (revision 1680)
  * 0.7: End of July, 2007 (revision 1809)
  * 0.8: Early October, 2007 (revision 1940)
  * 0.8.1: Early April, 2008 (revision 2282) 
  * 0.9: End of August, 2008 (revision 2578)
  * 0.9.1 Early September, 2009 (revision 3355)
  * 0.9.2 September 22, 2009 (revision 3380)
  * 0.9.3 May 01, 2010 (revision 4123)
  * 0.9.4 May 31, 2011 (revision 5233)
  --- Migrated to Sourceforge ---
  * 1.0.0: February 11, 2014 (revision 34)
  --- Migrated to Github ---
  * 1.1.0: February, 2016 
  * 1.2.0: January, 2017