[svn-r1874] Bringing all changes from R1.2 tree into R1.3 tree.
(except Datatypes.html, H5.format.html, ddl.html) This version of HDF5 Ref Manual includes FORTRAN API references.
This commit is contained in:
Frank Baker
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html>
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<<<<<<< Environment.html
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<head>
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<title>HDF5 Library Environment Variables and Configuration Parameters</title>
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<title>Environment Variables and Configuration Parameters</title>
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</head>
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<body bgcolor="#FFFFFF">
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</td>
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<td valign=top align=right>
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And in this document, the
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<a href="H5.user.html">HDF5 User's Guide</a>:
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<a href="Files.html">Files</a>
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<a href="H5.user.html"><strong>HDF5 User's Guide:</strong></a>
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<br>
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<a href="Files.html">Files</a>
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<a href="Datasets.html">Datasets</a>
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<a href="Datatypes.html">Data Types</a>
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<a href="Datatypes.html">Datatypes</a>
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<a href="Groups.html">Groups</a>
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<a href="References.html">References</a>
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<br>
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<a href="References.html">References</a>
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<a href="Attributes.html">Attributes</a>
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<a href="Properties.html">Property Lists</a>
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<a href="Errors.html">Error Handling</a>
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<a href="MountingFiles.html">Mounting Files</a>
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<br>
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<a href="Performance.html">Performance</a>
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<a href="Debugging.html">Debugging</a>
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Environment
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<a href="ddl.html">DDL</a>
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<br>
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<a href="Ragged.html">Ragged Arrays</a>
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<!--
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<hr>
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And in this document, the
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<a href="H5.user.html">HDF5 User's Guide</a>:
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<a href="Attributes.html">H5A</a>
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<a href="Datasets.html">H5D</a>
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<a href="Files.html">H5F</a>
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<a href="Groups.html">H5G</a>
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<a href="Properties.html">H5P</a>
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<a href="References.html">H5R & H5I</a>
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<a href="Ragged.html">H5RA</a>
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<a href="Dataspaces.html">H5S</a>
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<a href="Datatypes.html">H5T</a>
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<a href="Filters.html">H5Z</a>
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<a href="Caching.html">Caching</a>
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<a href="Chunking.html">Chunking</a>
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<a href="Debugging.html">Debugging</a>
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<a href="Environment.html">Environment</a>
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<a href="ddl.html">DDL</a>
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-->
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</td></tr>
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</table>
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</center>
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@@ -129,155 +113,42 @@ will display the current list of parameters and their effects.
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</td>
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<td valign=top align=right>
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And in this document, the
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<a href="H5.user.html">HDF5 User's Guide</a>:
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<a href="Files.html">Files</a>
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<a href="H5.user.html"><strong>HDF5 User's Guide:</strong></a>
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<br>
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<a href="Files.html">Files</a>
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<a href="Datasets.html">Datasets</a>
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<a href="Datatypes.html">Data Types</a>
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<a href="Datatypes.html">Datatypes</a>
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<a href="Dataspaces.html">Dataspaces</a>
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<a href="Groups.html">Groups</a>
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<a href="References.html">References</a>
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<br>
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<a href="References.html">References</a>
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<a href="Attributes.html">Attributes</a>
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<a href="Properties.html">Property Lists</a>
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<a href="Errors.html">Error Handling</a>
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<a href="Filters.html">Filters</a>
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<a href="Caching.html">Caching</a>
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<br>
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<a href="Filters.html">Filters</a>
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<a href="Palettes.html">Palettes</a>
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<a href="Caching.html">Caching</a>
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<a href="Chunking.html">Chunking</a>
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<a href="MountingFiles.html">Mounting Files</a>
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<br>
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<a href="Performance.html">Performance</a>
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<a href="Debugging.html">Debugging</a>
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Environment
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<a href="ddl.html">DDL</a>
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<br>
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<a href="Ragged.html">Ragged Arrays</a>
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<!--
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<hr>
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And in this document, the
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<a href="H5.user.html">HDF5 User's Guide</a>:
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<a href="Attributes.html">H5A</a>
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<a href="Datasets.html">H5D</a>
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<a href="Errors.html">H5E</a>
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<a href="Files.html">H5F</a>
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<a href="Groups.html">H5G</a>
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<a href="Properties.html">H5P</a>
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<a href="References.html">H5R & H5I</a>
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<a href="Ragged.html">H5RA</a>
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<a href="Dataspaces.html">H5S</a>
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<a href="Datatypes.html">H5T</a>
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<a href="Filters.html">H5Z</a>
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<a href="Caching.html">Caching</a>
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<a href="Chunking.html">Chunking</a>
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<a href="Debugging.html">Debugging</a>
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<a href="Environment.html">Environment</a>
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<a href="ddl.html">DDL</a>
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-->
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</td></tr>
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</table>
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</center>
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<hr>
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<address>
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<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
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</address>
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=======
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<head>
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<title>HDF5 Library Environment Variables
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and Configuration Parameters</title>
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</head>
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<body>
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<h1>HDF5 Library Environment Variables and Configuration Parameters</h1>
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<h2>1. Environment Variables</h2>
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The HDF5 library uses UNIX environment variables to control
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or adjust certain library features at runtime. The variables and
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their defined effects are as follows:
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<center>
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<table width="90%">
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<tr>
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<th>Variable</th>
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<th>Description</th>
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</tr>
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<tr valign=top>
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<td><code>HDF5_DEBUG</code></td>
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<td>Defines a list of debugging switches documented in the
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<a href="Debugging.html">Debugging</a> section of the
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<cite>HDF5 User's Guide</cite>.</td>
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</tr>
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<tr valign=top>
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<td><code>HDF5_NOCLEANUP</code></td>
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<td>If set then programs in the test directories do not
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remove temporary files. The default is for each test to
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remove the files before exit if the test succeeds but to
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leave the files if the test fails.</td>
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</tr>
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<tr valign=top>
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<td><code>HDF5_PREFIX</code></td>
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<td>The value of this variable is prepended to all temporary
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file names created by the test programs and separated from
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the base name of the file by a slash. The default is no
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prefix.</td>
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</tr>
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<tr valign=top>
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<td><ode>HDF5_DRIVER</code></td>
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<td>This variable should hold the name of a low-level HDF5
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file driver such as <code>sec2</code>, <code>stdio</code>,
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<code>core</code>, <code>split</code>, or
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<code>family</code>. The family driver also takes an
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optional real-valued family member size in MB which
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defaults to 1. If this variable is not set or empty then
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the library-defined default file driver is used (which can
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be set at configuration time with the H5F_LOW_DFLT cpp
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constant, usually <code>sec2</code>).</td>
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</tr>
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<tr valign=top>
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<td><code>HDF5_MPI_OPT_TYPES</code></td>
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<td>When set to <code>1</code>, parallel HDF5 will use the
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MPI-optimized code to perform parallel read/write accesses
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to datasets. Currently, this optimization fails when
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accessing extendable datasets. The default is not to use
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the optimized code.</td>
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</tr>
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<tr valign=top>
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<td><code>HDF5_MPI_1_METAWRITE</code></td>
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<td>When set to <code>1</code>, parallel HDF5 will write the
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metadata via process 0 of each opened parallel HDF5 file.
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This should improve I/O throughput. The default is not to
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use this optimization.</td>
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</tr>
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</table>
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</center>
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<h2>2. Configuration Parameters</h2>
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The HDF5 configuration script accepts a list of parameters to control
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configuration features when creating the Makefiles for the library.
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The command
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<br>
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<code> configure --help </code>
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<br>
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will display the current list of parameters and their effects.
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<hr>
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<address>
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<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
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</address>
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Last modified: 25 November 1998
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Last modified: 14 October 1999
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</body>
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</html>
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