### Author:  [@jan](https://swi-prolog.discourse.group/u/jan)
#### Post date: [November 5, 2025, 11:09am UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/1 "2025-11-05T11:09:13Z")
Dear SWI-Prolog user,
Version 9.3.34 is ready for download. Almost all changes are bugfixes
and enhancements to the development environment and tools. Notably
- Commandline history handling is simplified a lot by removing a
lot of old code and building on top of the enhanced libedit
extension. Notably, reusing command using `!!`, `!`,
etc is now enabled by default.
- Epilog now uses the native OS file dialog to ask for files to
consult, edit or create.
- Epilog now binds opening a link to Ctrl-click.
- Breakpoint feedback has been fixed.
- Fixed memory issue and multi-thread access to xpce (thanks to
@mike.elston).
# SWI-Prolog Changelog since version 9.3.33
- MODIFIED: Use `bool` types for profiling API Should have low impact.
Used by xpce.
- FIXED: Disable Epilog if threads in single threaded version.
- MODIFIED: halt/1: forward to main thread. If halt/1 is initiated
from a thread other than `main`, `main` is signalled to terminate
the process. If the main thread does not do so within the time
specified by the Prolog flag `halt_grace_time` (default 1 second),
the process is forcefully terminated.
- MODIFIED: Commandline history handling. Comandline history handling
used a double administration, both saving command as Prolog facts and
in the commandline editor. Now the commandline editor is in charge.
Visible changes to the user:
- COMPAT: Use new prolog:message\_action/2
- ADDED: prolog:message\_action/2 hook. This separates side effects on
messages from printing messages, allowing side effects to take place
even if an earlier print hook suppresses the message.
- FIXED: Use library broadcast to tell other components of modified
break-points.
- TEST: Do not run the “unprotected” tests if `protect_static_code`
is set.
- FIXED: `'$clause_from_source'/4`, used for setting break-points.
- DOC: Do not run test\_installation twice
- ENHANCED: xref\_source/2: emit warning on late meta\_predicate/1 This
directive must appear before the predicate is being used (called).
- PPA: Added Ubuntu 25.10 (Questing Quokka)
## Package chr
- COMPAT: Use new prolog:message\_action/2
## Package http
- COMPAT: Use new prolog:message\_action/2
## Package libedit
- FIXED: Signal handling Detecting this is the main stdin we are reading
from failed since we use dup() on the file handles to avoid closing
them. We now add this fact to the context, initiated before the dup().
- UPDATED: prolog:history/2 to support new core functionality.
- ADDED: Extended el\_history/2 with more actions. This allows for
querying individual events, setting the notion of _current_, and
searching the history.
- ENHANCED: Read old `swipl-win.exe` history data in current version.
- MODIFIED: el\_read\_history/2 to raise an error if the history file
is invalid.
- PORT: Compile if H\_SAVE\_FP is lacking
- ADDED: el\_history/2: `getsize(-Size)` support.
## Package pldoc
- FIXED: Load when threads are disabled.
- COMPAT: Use new prolog:message\_action/2
## Package plunit
- COMPAT: Use new prolog:message\_action/2
## Package xpce
- ENHANCED: Start Epilog file dialog in working directory.
- ENHANCED: Make _Quit Prolog_ the default button for confirming close
with open windows.
- ADDED: Allow inspecting the GUI hierarchy from Epilog.
- ADDED: pce\_show\_visual\_tool/0 to library(man/v\_visual). This allows
showing the GUI inspector stand-alone.
- FIXED: Block other Prolog threads while a window is being redrawn.
Modifying graphics while a redraw is in progress may result in
inconsistent graphics or crashes.
- FIXED: Thread specific module and context object. These two global
variables are used in the xpce interface predicates to keep track of
the context. As xpce allows access from multiple threads they must
be thread specific.
- FIXED: Exclude files that require threads for single threaded version.
- FIXED: Ensure Prolog exceptions are propagated through xpce.
- FIXED: Epilog: save history in all scenarios This covers closing the
main window using the menu, window close button, Ctrl-D, Shift-Ctrl-W.
- ENHANCED: Epilog: use native file dialog
- ADDED: `frame<-open_file` and `frame<-save_file`: use OS dialog
to prompt for a file. These new methods use SDL3’s interface to file
dialog windows to ask for a file for reading or writing. Tested to
work on MacOS, Windows and Fedora using Gnome.
- ENHANCED: Do not load theme based on `display<-theme` if a theme was
already loaded.
- FIXED: Use-after-free in `frame<-confirm` Also allows this method to
run from any thread.
- ENHANCED: Show fragment icons vertically aligned in the line.
- COMPAT: Use new prolog:message\_action/2
- FIXED: Show breakpoints in PceEmacs and GUI tracer No longer rely
on messages. There is a problem with the message system where
user:message\_hook/3 is both used to redirect messages and to act
on messages. The latter are hooks that fail, the first are hooks
that succeed. It might be better to have two hooks.
- FIXED: Possible use-after-free
- MODIFIED: Epilog terminal to follow links on Ctrl-click Used
to be simple click. This causes too much unintended actions.
Using Ctrl-click is consistent with other terminal emulators.
---
### Author:  [@Boris](https://swi-prolog.discourse.group/u/Boris)
#### Post date: [November 5, 2025, 12:57pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/2 "2025-11-05T12:57:37Z")
> [@jan](#):
>
> MODIFIED: Commandline history handling.
Probably not intended. When I started swipl in a directory that had history already, it started counting at 101
```prolog
$ swipl
Welcome to SWI-Prolog (threaded, 64 bits, version 9.3.34)
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software.
Please run ?- license. for legal details.
For online help and background, visit https://www.swi-prolog.org
For built-in help, use ?- help(Topic). or ?- apropos(Word).
101 ?-
```
After a few commands I was at 106; the oldest command I could access was 6:
```prolog
106 ?- !1.
! No such event
106 ?- !2.
! No such event
106 ?- !3.
! No such event
106 ?- !4.
! No such event
106 ?- !5.
! No such event
106 ?- !6.
use_module(library(dcg/basics)).
true.
```
I can see how that somehow makes sense, I don’t know if it is the desired behaviour.
---
### Author:  [@jan](https://swi-prolog.discourse.group/u/jan)
#### Post date: [November 5, 2025, 1:20pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/3 "2025-11-05T13:20:25Z")
> [@Boris](#):
>
> I can see how that somehow makes sense, I don’t know if it is the desired behaviour.
Yes 🙂 The default history depth is 100. That means that any other command added to the history causes the oldest to be deleted. When saving, it saves all 100 (or as many there are) to a file. Restarting loads these 100 commands and thus the next query is ?- 101.
That is how it works in libedit. The rest is now just some Prolog code around it.
---
### Author:  [@stassa.p](https://swi-prolog.discourse.group/u/stassa.p)
#### Post date: [November 7, 2025, 1:21am UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/4 "2025-11-07T01:21:16Z")
> [@jan](#):
>
> If library(editline) is not available, there is no history.
Does that mean there is no history on windows?
---
### Author:  [@jan](https://swi-prolog.discourse.group/u/jan)
#### Post date: [November 7, 2025, 8:34am UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/5 "2025-11-07T08:34:48Z")
No. The Windows version comes with library(editline). I had to hack the BSD library a bit. That was done by other people, but those ports relied on a lot of other Unix compatibility libraries. I merely replaced some of the low level I/O routines to call native Windows and hard coded that the use of ANSI escape sequences, which is fine for the Windows native consoles as well as the Epilog Prolog consoles.
That is a large part of the beauty of the current code base: it is pretty much the same on all platforms. Before we had a lot of different setups for the console that all had there own peculiar behaviour. Now both `swipl` and `swipl-win` behave pretty much the same on Linux/\*BSD, MacOS and Windows.
---
### Author:  [@joseph-vidal-rosset](https://swi-prolog.discourse.group/u/joseph-vidal-rosset)
#### Post date: [November 11, 2025, 2:24pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/6 "2025-11-11T14:24:44Z")
Hi Jan.
This error :
```prolog
QLF compile library
ERROR: /usr/local/wasm/swipl-devel/build/home/library/ext/json/json_schema.pl:62:
ERROR: source_sink \`library(pcre)’ does not exist
Warning: /usr/local/wasm/swipl-devel/build/home/library/ext/json/json_schema.pl:62:
Warning: Goal (directive) failed: json_schema:use_module(library(pcre),\[re_match/2\])
root@sd-159644:/usr/local/wasm/swipl-devel/build#
```
But :
```prolog
root@sd-159644:/usr/local/wasm/swipl-devel/build# cd /usr/local/wasm/pcre2-10.42
root@sd-159644:/usr/local/wasm/pcre2-10.42# ls
132html config.sub libpcre2-posix.a pcre2.h
aclocal.m4 configure libpcre2-posix.pc pcre2posix_test.js
ar-lib configure.ac libpcre2-posix.pc.in pcre2posix_test.wasm
AUTHORS COPYING LICENCE pcre2test.js
build.ninja CTestCustom.ctest ltmain.sh pcre2_test.sh
ChangeLog CTestTestfile.cmake m4 pcre2test.wasm
CheckMan depcomp Makefile.am perltest.sh
CleanTxt Detrail Makefile.in PrepareRelease
cmake doc missing README
CMakeCache.txt HACKING NEWS RunGrepTest
CMakeFiles INSTALL NON-AUTOTOOLS-BUILD RunGrepTest.bat
cmake_install.cmake install-sh pcre2_chartables.c RunTest
CMakeLists.txt libpcre2-16.pc.in pcre2-config RunTest.bat
compile libpcre2-32.pc.in pcre2-config.in src
config-cmake.h.in libpcre2-8.a pcre2grep.js testdata
config.guess libpcre2-8.pc pcre2_grep_test.sh test-driver
config.h libpcre2-8.pc.in pcre2grep.wasm
root@sd-159644:/usr/local/wasm/pcre2-10.42#\`\`\`
pcre2 is nevertheless installed.. I do not understand.
```
---
### Author:  [@joseph-vidal-rosset](https://swi-prolog.discourse.group/u/joseph-vidal-rosset)
#### Post date: [November 11, 2025, 3:02pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/7 "2025-11-11T15:02:46Z")
I have reinstalled
root@sd-159644:/usr/local/wasm/pcre2# ls
132html COPYING LICENCE pcre2posix\_test.js
AUTHORS CTestCustom.ctest m4 pcre2posix\_test.wasm
autogen.sh CTestTestfile.cmake maint pcre2test.js
BUILD.bazel Detrail Makefile.am pcre2\_test.sh
build.ninja doc MODULE.bazel pcre2test.wasm
ChangeLog HACKING NEWS perltest.sh
CheckMan index.md NON-AUTOTOOLS-BUILD PrepareRelease
CleanTxt install\_manifest.txt pcre2\_chartables.c README
cmake libpcre2-16.pc.in pcre2-config README.md
CMakeCache.txt libpcre2-32.pc.in pcre2-config.in RunGrepTest
CMakeFiles libpcre2-8.a pcre2\_fuzzer.dict RunGrepTest.bat
cmake\_install.cmake libpcre2-8.pc pcre2\_fuzzer.options RunTest
CMakeLists.txt libpcre2-8.pc.in pcre2grep.js RunTest.bat
config-cmake.h.in libpcre2-posix.a pcre2\_grep\_test.sh src
config.h libpcre2-posix.pc pcre2grep.wasm testdata
configure.ac libpcre2-posix.pc.in pcre2.h WORKSPACE.bazel
root@sd-159644:/usr/local/wasm/pcre2#
But :
ERROR: /usr/local/wasm/swipl-devel/build/home/library/ext/json/json\_schema.pl:62:
ERROR: source\_sink `library(pcre)’ does not exist
Warning: /usr/local/wasm/swipl-devel/build/home/library/ext/json/json\_schema.pl:62:
Warning: Goal (directive) failed: json\_schema:use\_module(library(pcre),[re\_match/2])
☹
---
### Author:  [@jan](https://swi-prolog.discourse.group/u/jan)
#### Post date: [November 11, 2025, 3:05pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/8 "2025-11-11T15:05:26Z")
> [@joseph-vidal-rosset](#):
>
> `pcre2 is nevertheless installed.. I do not understand.`
Is the pcre2 library in the path given to `-DCMAKE_FIND_ROOT_PATH=`? Does this work
```
node src/swipl.js
?- use_module(library(pce)).
```
P.s. Please put code in a block guarded by two ````` lines (or indent the code lines with 4 spaces).
P.s. Pushed a patch to omit installing library(json\_schema) if regular expression are not provided.
---
### Author:  [@joseph-vidal-rosset](https://swi-prolog.discourse.group/u/joseph-vidal-rosset)
#### Post date: [November 11, 2025, 3:08pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/9 "2025-11-11T15:08:58Z")
```prolog
root@sd-159644:/usr/local/swipl-devel# node src/swipl.js
node:internal/modules/cjs/loader:1404
throw err;
^
Error: Cannot find module '/usr/local/swipl-devel/src/swipl.js'
at Function._resolveFilename (node:internal/modules/cjs/loader:1401:15)
at defaultResolveImpl (node:internal/modules/cjs/loader:1057:19)
at resolveForCJSWithHooks (node:internal/modules/cjs/loader:1062:22)
at Function._load (node:internal/modules/cjs/loader:1211:37)
at TracingChannel.traceSync (node:diagnostics_channel:322:14)
at wrapModuleLoad (node:internal/modules/cjs/loader:235:24)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:171:5)
at node:internal/main/run_main_module:36:49 {
code: 'MODULE_NOT_FOUND',
requireStack: []
}
Node.js v22.16.0
root@sd-159644:/usr/local/swipl-devel#
```
---
### Author:  [@joseph-vidal-rosset](https://swi-prolog.discourse.group/u/joseph-vidal-rosset)
#### Post date: [November 11, 2025, 3:11pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/10 "2025-11-11T15:11:31Z")
I add that I compiled pcre2 following your [instructions](https://swi-prolog.discourse.group/t/swi-prolog-in-the-browser-using-wasm/5650) .
---
### Author:  [@jan](https://swi-prolog.discourse.group/u/jan)
#### Post date: [November 11, 2025, 3:22pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/11 "2025-11-11T15:22:25Z")
The instructions still look fine. Works for me. You’ll have to work through the details of he messages to see what could be wrong. A good step is running
```
cmake .
```
in the build dir. That re-runs the configuration. Normally that is pretty silent, but it will print the things that went wrong while they can easily be missed during the initial cmake run.
---
### Author:  [@joseph-vidal-rosset](https://swi-prolog.discourse.group/u/joseph-vidal-rosset)
#### Post date: [November 11, 2025, 3:30pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/12 "2025-11-11T15:30:26Z")
```prolog
80/81 Test #80: json:json_schema .................***Failed 0.51 sec
ERROR: /usr/local/wasm/swipl-devel/build/home/library/ext/json/json_schema.pl:62:
ERROR: source_sink `library(pcre)' does not exist
Warning: /usr/local/wasm/swipl-devel/build/home/library/ext/json/json_schema.pl:62:
Warning: Goal (directive) failed: json_schema:use_module(library(pcre),[re_match/2])
Cannot find JSON Schema test data; skipping tests
Warning: [Thread main] Halting with status 1 due to 1 errors and 1 warnings
81/81 Test #81: ssl:ssl .......................... Passed 6.86 sec
99% tests passed, 1 tests failed out of 81
Total Test time (real) = 84.29 sec
The following tests FAILED:
80 - json:json_schema (Failed)
Errors while running CTest
root@sd-159644:/usr/local/wasm/swipl-devel/build# ninja install
[34/35] Install the project...
-- Install configuration: "PGO"
-- Set runtime path of "/root/lib/swipl/bin/x86_64-linux/swipl" to "/root/lib/swipl/lib/x86_64-linux"
-- Set runtime path of "/root/lib/swipl/lib/x86_64-linux/libswipl.so.9.3.34" to "/root/lib/swipl/lib/x86_64-linux"
-- Set runtime path of "/root/lib/swipl/bin/x86_64-linux/swipl-win" to "/root/lib/swipl/lib/x86_64-linux"
-- Set runtime path of "/root/lib/swipl/bin/x86_64-linux/swipl-ld" to "/root/lib/swipl/lib/x86_64-linux"
root@sd-159644:/usr/local/wasm/swipl-devel/build# swipl --version
SWI-Prolog version 9.3.28 for x86_64-linux
root@sd-159644:/usr/local/wasm/swipl-devel/build#
```
---
### Author:  [@joseph-vidal-rosset](https://swi-prolog.discourse.group/u/joseph-vidal-rosset)
#### Post date: [November 11, 2025, 4:07pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/13 "2025-11-11T16:07:44Z")
```prolog
-- Generating done
-- Build files have been written to: /usr/local/wasm/swipl-devel/build.wasm
root@sd-159644:/usr/local/wasm/swipl-devel/build.wasm# ninja
[590/595] QLF compile library
ERROR: /usr/local/wasm/swipl-devel/build.wasm/home/library/ext/json/json_schema.pl:74:
ERROR: source_sink `library(http/http_open)' does not exist
Warning: /usr/local/wasm/swipl-devel/build.wasm/home/library/ext/json/json_schema.pl:74:
Warning: Goal (directive) failed: json_schema:use_module(library(http/http_open),[http_open/3])
[594/595] Linking C executable src/swipl-web.js
compressing package of size 9606302
compressed package into 5040871
compressed in 606 ms
[595/595] Linking C executable src/swipl-bundle.js
root@sd-159644:/usr/local/wasm/swipl-devel/build.wasm#
```
---
### Author:  [@jan](https://swi-prolog.discourse.group/u/jan)
#### Post date: [November 11, 2025, 4:33pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/14 "2025-11-11T16:33:38Z")
> [@joseph-vidal-rosset](#):
>
> `ERROR: source_sink `library(http/http\_open)’ does not exist`
Pull the latest version and this should be fixed. When building from git source, please check there are no updates or give the version you try to build.
---
### Author:  [@Boris](https://swi-prolog.discourse.group/u/Boris)
#### Post date: [November 12, 2025, 7:51am UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/15 "2025-11-12T07:51:01Z")
More building blues.
```prolog
Building C object packages/xpce/C...es/plugin_pl2xpce.dir/src/txt/terminal.c.
FAILED: [code=1] packages/xpce/CMakeFiles/plugin_pl2xpce.dir/src/txt/terminal.c.o
/usr/bin/gcc -Dplugin_pl2xpce_EXPORTS -I/Users/booris/install/swipl-devel/build/packages/xpce -I/Users/booris/install/swipl-devel/packages/xpce/src -I/Users/booris/install/swipl-devel/src/os -I/Users/booris/install/swipl-devel/src -isystem /opt/homebrew/Cellar/cairo/1.18.4/include/cairo -isystem /opt/homebrew/Cellar/fontconfig/2.17.1/include -isystem /opt/homebrew/opt/freetype/include/freetype2 -isystem /opt/homebrew/opt/libpng/include/libpng16 -isystem /opt/homebrew/Cellar/libxext/1.3.6/include -isystem /opt/homebrew/Cellar/xorgproto/2024.1/include -isystem /opt/homebrew/Cellar/libxrender/0.9.12/include -isystem /opt/homebrew/Cellar/libx11/1.8.12/include -isystem /opt/homebrew/Cellar/libxcb/1.17.0/include -isystem /opt/homebrew/Cellar/libxau/1.0.12/include -isystem /opt/homebrew/Cellar/libxdmcp/1.1.5/include -isystem /opt/homebrew/Cellar/pixman/0.46.4/include/pixman-1 -isystem /opt/homebrew/Cellar/pango/1.57.0_1/include/pango-1.0 -isystem /opt/homebrew/Cellar/harfbuzz/12.2.0/include/harfbuzz -isystem /opt/homebrew/Cellar/graphite2/1.3.14/include -isystem /opt/homebrew/Cellar/glib/2.86.1/include -isystem /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/ffi -isystem /opt/homebrew/Cellar/glib/2.86.1/include/glib-2.0 -isystem /opt/homebrew/Cellar/glib/2.86.1/lib/glib-2.0/include -isystem /opt/homebrew/opt/gettext/include -isystem /opt/homebrew/Cellar/pcre2/10.47/include -isystem /opt/homebrew/Cellar/fribidi/1.0.16/include/fribidi -isystem /opt/homebrew/include -isystem /opt/homebrew/opt/libedit/include -isystem /opt/homebrew/opt/zlib/include -isystem /opt/homebrew/opt/ncurses/include -O2 -g -DNDEBUG -std=gnu11 -arch arm64 -fPIC -fvisibility=hidden -Wall -DHAVE_CONFIG_H -DSWI -D __SWI_PROLOG__ -MD -MT packages/xpce/CMakeFiles/plugin_pl2xpce.dir/src/txt/terminal.c.o -MF packages/xpce/CMakeFiles/plugin_pl2xpce.dir/src/txt/terminal.c.o.d -o packages/xpce/CMakeFiles/plugin_pl2xpce.dir/src/txt/terminal.c.o -c /Users/booris/install/swipl-devel/packages/xpce/src/txt/terminal.c
/Users/booris/install/swipl-devel/packages/xpce/src/txt/terminal.c:3624:37: error: use of undeclared identifier 'SIGWINCH'
3624 | pthread_kill(b->pty.client_thread, SIGWINCH);
| ^
1 error generated.
```
It looks almost as if there is an include missing in this file but I can’t tell for sure.
`SIGWINCH` should be in signal.h, but just including it naively in the file did not help.
---
### Author:  [@jan](https://swi-prolog.discourse.group/u/jan)
#### Post date: [November 12, 2025, 9:05am UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/16 "2025-11-12T09:05:41Z")
> [@Boris](#):
>
> ```prolog
> /Users/booris/install/swipl-devel/packages/xpce/src/txt/terminal.c:3624:37: error: use of undeclared identifier 'SIGWINCH'
> 3624 | pthread_kill(b->pty.client_thread, SIGWINCH);
>
> ```
There is an include file (``) missing, though both on MacOS and Fedora 42 it was apparently pulled in indirectly. Added it explicitly to `terminal.c`, but as you say it didn’t help. That is really weird. `SIGWINCH` should be defined in any fairly recent Unix-like OS. As the code relies on the grantpt() PTY API, we know we have fairly recent Unix-like OS.
I made the call conditional on whether `SIGWINCH` is defined, so it will always compile (with a `#warning`).
The call is needed to make command line editing while resizing Epilog windows work correctly.
Which OS and version are we talking about?
---
### Author:  [@Boris](https://swi-prolog.discourse.group/u/Boris)
#### Post date: [November 12, 2025, 9:23am UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/17 "2025-11-12T09:23:41Z")
> [@jan](#):
>
> Which OS and version are we talking about?
MacOS Sequoia Version 15.7.2
---
### Author:  [@jan](https://swi-prolog.discourse.group/u/jan)
#### Post date: [November 12, 2025, 9:46am UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/18 "2025-11-12T09:46:19Z")
> [@Boris](#):
>
> MacOS Sequoia Version 15.7.2
I thought I’d verified this. Apparently not (correctly) ☹ This reproduces on my Mac. The latest git does compile with a warning. First some other stuff then I’ll try to figure out why.
---
### Author:  [@jan](https://swi-prolog.discourse.group/u/jan)
#### Post date: [November 12, 2025, 10:23am UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/19 "2025-11-12T10:23:57Z")
> [@jan](#):
>
> I’ll try to figure out why.
Its a bit of a mystery. They only define `SIGWINCH` under some conditions, but I fail to set the right conditions. Setting the right `#define` while loading `` is apparently overruled somewhere else ☹ Assuming they wont change the signal number I just hard coded it for MacOS if it is missing. That works. If anyone can find a cleaner solution, please make a PR.
---
### Author:  [@joseph-vidal-rosset](https://swi-prolog.discourse.group/u/joseph-vidal-rosset)
#### Post date: [November 12, 2025, 2:17pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-3-34/9370/20 "2025-11-12T14:17:48Z")
Hi Jan, many thanks for all. I just pulled the latest version and you were right, of course, all is fixed now. The wasm version of SWI-Prolog is very nice, very efficient. We are all thankfull for this excellent job. All the best.