AWKLIBPATH environment variable is similar to the
variable, but it is used to search for shared libraries specified
with the -l option rather than for source files. If the library
is not found, the path is searched again after adding the appropriate
shared library suffix for the platform. For example, on GNU/Linux systems,
the suffix ‘.so’ is used.
The search path specified is also used for libraries loaded via the
‘@load’ keyword (see Loading Shared Libraries).