SWI-Prolog has check_installation/0

Nice to know
1

If you get errors like

ERROR:    source_sink `library(http/http_unix_daemon)' does not exist

then check_installation/0 might help.

Windows Example (Click here to expand) 
?- check_installation.
% Checking your SWI-Prolog kit for common issues ...
% 
% Version: ............. 8.3.4-18-ge5d07a583
% Address bits: ........ 64
% Architecture: ........ x64-win64
% Installed at: ........ c:/program files/swipl
% Cores: ............... 4
% 
% Checking tcmalloc ............................ not present
Warning: See http://www.swi-prolog.org/build/issues/tcmalloc.html
% Checking gmp ................................. ok
% Loading library(archive) ..................... ok
%   Supported filters: bzip2, compress, gzip, grzip, lrzip, lzip, lzma, lzop, none, rpm, uu, xz
%   Supported formats: 7zip, ar, cab, cpio, empty, gnutar, iso9660, lha, mtree, rar, raw, tar, xar, zip
% Loading library(cgi) ......................... ok
% Loading library(crypt) ....................... ok
% Loading library(bdb) ......................... ok
% Loading library(double_metaphone) ............ ok
% Loading library(filesex) ..................... ok
% Loading library(http/http_stream) ............ ok
% Loading library(http/json) ................... ok
% Loading library(http/jquery) ................. ok
%   jQuery from c:/program files/swipl/library/http/web/js/jquery-1.11.3.min.js
% Loading library(isub) ........................ ok
% Loading library(jpl) ...
% Extended DLL search path with
%   'c:/Program Files/Java/jdk-12/bin/server'
%   'c:/Program Files/Java/jdk-12/bin'
................................................ ok
% Loading library(memfile) ..................... ok
% Loading library(odbc) ........................ ok
% Loading library(pce) ......................... ok
% Loading library(pcre) ........................ ok
% Loading library(pdt_console) ................. ok
% Loading library(porter_stem) ................. ok
% Loading library(process) ..................... ok
% Loading library(protobufs) ................... ok
% Loading library(readutil) .................... ok
% Loading library(semweb/rdf_db) ............... ok
% Loading library(semweb/rdf_ntriples) ......... ok
% Loading library(semweb/turtle) ............... ok
% Loading library(sgml) ........................ ok
% Loading library(sha) ......................... ok
% Loading library(snowball) .................... ok
% Loading library(socket) ...................... ok
% Loading library(ssl) ......................... ok
% Loading library(crypto) ...................... ok
% Loading library(table) ....................... ok
% Loading library(time) ........................ ok
% Loading library(unicode) ..................... ok
% Loading library(uri) ......................... ok
% Loading library(uuid) ........................ ok
% Loading library(zlib) ........................ ok
% Loading library(yaml) ........................ ok
Warning: Found 1 issues.
true.
Ubuntu Example (Click here to expand) 
?- check_installation.
% Checking your SWI-Prolog kit for common issues ...
%
% Version: ............. 8.3.4
% Address bits: ........ 64
% Architecture: ........ x86_64-linux
% Installed at: ........ /usr/lib/swi-prolog
% Cores: ............... 4
%
% Checking tcmalloc ............................ not present
Warning: See http://www.swi-prolog.org/build/issues/tcmalloc.html
% Checking gmp ................................. ok
% Loading library(archive) ..................... ok
%   Supported filters: bzip2, compress, gzip, grzip, lrzip, lzip, lzma, lzop, none, rpm, uu, xz
%   Supported formats: 7zip, ar, cab, cpio, empty, gnutar, iso9660, lha, mtree, rar, raw, tar, xar, zip
% Loading library(cgi) ......................... ok
% Loading library(crypt) ....................... ok
Warning: library(bdb) .......................... NOT FOUND
Warning: See http://www.swi-prolog.org/build/issues/bdb.html
% Loading library(double_metaphone) ............ ok
% Loading library(filesex) ..................... ok
% Loading library(http/http_stream) ............ ok
% Loading library(http/json) ................... ok
% Loading library(http/jquery) ................. ok
%   jQuery from /usr/share/javascript/jquery/jquery.min.js
% Loading library(isub) ........................ ok
% Loading library(jpl) ......................... FAILED
Warning: Cannot load required shared library
Warning: See http://www.swi-prolog.org/build/issues/jpl.html
% Loading library(memfile) ..................... ok
% Loading library(odbc) ........................ ok
% Loading library(pce) ......................... ok
% Loading library(pcre) ........................ ok
% Loading library(pdt_console) ................. ok
% Loading library(porter_stem) ................. ok
% Loading library(process) ..................... ok
% Loading library(protobufs) ................... ok
% Loading library(editline) .................... ok
% Loading library(readline) .................... ok
% Loading library(readutil) .................... ok
% Loading library(rlimit) ...................... ok
% Loading library(semweb/rdf_db) ............... ok
% Loading library(semweb/rdf_ntriples) ......... ok
% Loading library(semweb/turtle) ............... ok
% Loading library(sgml) ........................ ok
% Loading library(sha) ......................... ok
% Loading library(snowball) .................... ok
% Loading library(socket) ...................... ok
% Loading library(ssl) ......................... ok
% Loading library(crypto) ...................... ok
% Loading library(syslog) ...................... ok
% Loading library(table) ....................... ok
% Loading library(time) ........................ ok
% Loading library(tipc/tipc) ................... ok
% Loading library(unicode) ..................... ok
% Loading library(uri) ......................... ok
% Loading library(uuid) ........................ ok
% Loading library(zlib) ........................ ok
% Loading library(yaml) ........................ ok
Warning: Found 3 issues.
true.

Side note: The reason for the error is that I pulled the code (plweb) down using git on Ubuntu on WSL 2 but started SWI-Prolog from Windows, i.e. swipl -l load.pl.

2

The problem probably remains that plweb uses the library(http/http_unix_daemon) :frowning: Code may require some changes to run on Windows (it should run on the WSL version).

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