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Alternative SLEPc builds for slepc4py
=====================================
slepc4py is available for python3 with support for
real numbers (python3-slepc4py-real)
and complex numbers (python3-slepc4py-complex).
Either build is accessible at runtime. By default slepc4py uses the
default SLEPc build set in /usr/lib/slepc (which can be selected with
"update-alternatives --config slepc")
Other SLEPc builds can be selected at runtime by setting (or exporting)
the SLEPC_DIR environment variable.
Examples include:
SLEPC_DIR=/usr/lib/slepcdir/slepc-real
selects the preferred real-number version of SLEPc, by default the
latest version, but can be selected with
"update-alternatives --config libslepc_real.so"
SLEPC_DIR=/usr/lib/slepcdir/slepc-complex
selects the preferred complex-number version of SLEPc, by default the
latest version, but can be selected with
"update-alternatives --config libslepc_complex.so"
Specific SLEPc versions and builds as found under /usr/lib/slepcdir
(or elsewhere) can also be selected with SLEPC_DIR.
For example,
SLEPC_DIR=/usr/lib/slepcdir/slepc-complex python3 -c "import slepc4py; print(slepc4py.__path__)"
prints the path to the slepc4py module built against the preferred
complex-number build of SLEPc.
The PETSC_DIR environment variable corresponding to the given
SLEPC_DIR should also be set, of course.
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