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# Installation Debugging Hints

If the user encounters difficulty in the installation process, we suggest the following:

- Obtain prebuilt ScaLAPACK and BLACS libraries on netlib for a variety of architectures.

  > `http://www.netlib.org/scalapack/archives/`
  > `http://www.netlib.org/blacs/archives/`

- Obtain sample `SLmake.inc` files for a variety of architectures in the `SCALAPACK/INSTALL` directory in the scalapack distribution tar file. Sample `Bmake.inc` files are included in the `BLACS/BMAKES` directory in the blacs distribution file.
- Consult the ScaLAPACK FAQ list on netlib.
- Consult the `errata.scalapack` file in the scalapack directory on netlib, and/or the `errata.blacs` file in the blacs directory on netlib. These files contain a list of known difficulties that have been diagnosed and corrected (or will be corrected in the next release), or reported to the vendor as in the case of message-passing libraries or optimized BLAS .
- Always run the BLACS, BLAS, and PBLAS test suites to ensure that these libraries have been properly installed. (If PVM is the underlying message-passing layer, please also run the PVM test suite.) If a problem is detected in the BLAS or BLACS libraries, try linking to the reference implementations to be found in the respective blas or blacs directory on netlib.
- If ScaLAPACK is being tested on a heterogeneous cluster of computers, please ensure that all executables are linked with the same debug level of the BLACS. Otherwise, unpredictable results will occur because the debug level 1 BLACS (specified by `BLACSDBGLVL=1` in `Bmake.inc`) perform error-checking and thus send more messages than the performance debug level 0 BLACS (specified by `BLACSDBGLVL=0` in `Bmake.inc`).