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+from spack import *
+
+
+class ArpackNg(Package):
+ """
+ ARPACK-NG is a collection of Fortran77 subroutines designed to solve large scale eigenvalue problems.
+
+ Important Features:
+
+ * Reverse Communication Interface.
+ * Single and Double Precision Real Arithmetic Versions for Symmetric,
+ Non-symmetric, Standard or Generalized Problems.
+ * Single and Double Precision Complex Arithmetic Versions for Standard or
+ Generalized Problems.
+ * Routines for Banded Matrices - Standard or Generalized Problems.
+ * Routines for The Singular Value Decomposition.
+ * Example driver routines that may be used as templates to implement numerous
+ Shift-Invert strategies for all problem types, data types and precision.
+
+ This project is a joint project between Debian, Octave and Scilab in order to
+ provide a common and maintained version of arpack.
+
+ Indeed, no single release has been published by Rice university for the last
+ few years and since many software (Octave, Scilab, R, Matlab...) forked it and
+ implemented their own modifications, arpack-ng aims to tackle this by providing
+ a common repository and maintained versions.
+
+ arpack-ng is replacing arpack almost everywhere.
+ """
+ homepage = 'https://github.com/opencollab/arpack-ng'
+ url = 'https://github.com/opencollab/arpack-ng/archive/3.3.0.tar.gz'
+
+ version('3.3.0', 'ed3648a23f0a868a43ef44c97a21bad5')
+
+ variant('shared', default=True, description='Enables the build of shared libraries')
+ variant('mpi', default=False, description='Activates MPI support')
+
+ # The function pdlamch10 does not set the return variable. This is fixed upstream
+ # see https://github.com/opencollab/arpack-ng/issues/34
+ patch('pdlamch10.patch', when='@3.3:')
+
+ depends_on('blas')
+ depends_on('lapack')
+ depends_on('mpi', when='+mpi')
+
+ def install(self, spec, prefix):
+ # Apparently autotools are not bootstrapped
+ bootstrap = Executable('./bootstrap')
+
+ options = ['--prefix=%s' % prefix]
+
+ if '+mpi' in spec:
+ options.append('--enable-mpi')
+
+ if '~shared' in spec:
+ options.append('--enable-shared=no')
+
+ bootstrap()
+ configure(*options)
+ make()
+ make('install')