The file ncbi.tar.Z is an L-Z compressed UNIX tar archive that contains all of
the files splayed beneath the "explode" subdirectory.  FTP the tar archive to
your local machine in binary mode, uncompress it, then untar it.

The ncbi/corelib subdirectory contains versions of some platform-specific
header files.  Headers for several computer software/hardware platforms are
provided, although they may be out of date.  Identify the ncbilcl.??? file
appropriate for your platform in the "corelib" directory, noting the
appropriate ??? filename extension to use.  If none of the existing
ncbilcl.???  files are appropriate, create one yourself using the others as
models.  The ncbilcl.sol and ncbilcl.sgi files may be good starting points.

To include parallel processing as one of the features of the BLAST programs,
the definition of the C preprocessor symbol "MPROC_AVAIL" must first be
uncommented from the platform-specific ncbilcl.h.  While the NCBI Toolbox
module itself contains no parallel-processing related code, it is important
that MPROC_AVAIL be defined in ncbilcl.h before one begins to compile and link
the "gish", "blast", and "blastapp" modules.  Special compiler and linker
options are also commonly required -- and should be used consistently
throughout ALL compilations of ALL modules -- when producing multithreaded
applications.

In the ncbi/make directory, identify the file named "makeall.unx" used to build
the ncbi linkable libraries on UNIX systems.  From the ncbi/build directory,
first run:

   make -f ../make/makeall.unx LCL=??? copy

where ??? is the appropriate filename extension identified earlier.  This
should copy source files (.c and .h) into the ncbi/build directory, as well as
place a copy of ncbilcl.??? named ncbilcl.h in the ncbi/build directory.

While still in the ncbi/build directory, then run:

   make -f ../make/makeall.unx LCL=??? nocopy

This should build linkable libraries, including libncbi.a, and place them in
the ncbi/lib directory.