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/usr/lib/x86_64-linux-gnu/ivl/system.sft is in iverilog 0.9.7-1.

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The actual contents of the file can be viewed below.

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#
# This is the system function descriptor table for the
# builtin (system) functions.
#

$random            vpiSysFuncInt
$rtoi              vpiSysFuncInt
$urandom           vpiSysFuncSized 32 unsigned
$urandom_range     vpiSysFuncSized 32 unsigned
$dist_uniform      vpiSysFuncInt
$dist_normal       vpiSysFuncInt
$dist_exponential  vpiSysFuncInt
$dist_poisson      vpiSysFuncInt
$dist_chi_square   vpiSysFuncInt
$dist_t            vpiSysFuncInt
$dist_erlang       vpiSysFuncInt
$clog2             vpiSysFuncInt
$q_full            vpiSysFuncInt

$abstime       vpiSysFuncReal
$simparam      vpiSysFuncReal
$simparam$str  vpiSysFuncSized 1024 unsigned