# Errors and a hang rebuilding **URL:** \ **Category:** Installing\ **Created:** [July 3, 2026, 3:11am UTC](https://swi-prolog.discourse.group/t/errors-and-a-hang-rebuilding/9719 "2026-07-03T03:11:12Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![mike.elston](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/mike.elston/32/3691_2.png) [@mike.elston](https://swi-prolog.discourse.group/u/mike.elston)\ **Post date:** [July 3, 2026, 3:11am UTC](https://swi-prolog.discourse.group/t/errors-and-a-hang-rebuilding/9719/1 "2026-07-03T03:11:12Z")
Hi Jan I routinely rebuild from source of Ubuntu without problems but today errors and a hang. Regards Mike PS Really sorry to hear of your health challenges. I hope you are putting your recovery ahead of swipl. ```prolog Distributor ID: Ubuntu Description: Ubuntu 26.04 LTS Release: 26.04 Codename: resolute ``` ````prolog rm -rf ~/lib/swipl cd ~/swipl-devel git pull git submodule update --init git clean -xfd git submodule foreach git clean -xfd mkdir build cd build cmake -DCMAKE_INSTALL_PREFIX=$HOME -DCMAKE_BUILD_TYPE=PGO -G Ninja .. ninja ctest -j $(nproc) --output-on-failure ninja install CMake Warning at packages/sweep/CMakeLists.txt:14 (message): Could not find emacs-module.h in system headers. Using our local copy from /home/mike/swipl-devel/packages/sweep % [32/62] ffi:save_load_int64 .................................................................................................................. **FAILED (0.001 sec) ERROR: [Thread main] /home/mike/swipl-devel/packages/cpp/test_ffi.pl:140: ERROR: [Thread main] test ffi:save_load_int64: received error: test_ffi:ffi_read_int64/2: No permission to write stream `(0xaaaaf4e09800)' (requested stream has wrong mode) % [33/62] ffi:save_load_int32 .................................................................................................................. **FAILED (0.001 sec) ERROR: [Thread main] /home/mike/swipl-devel/packages/cpp/test_ffi.pl:153: ERROR: [Thread main] test ffi:save_load_int32: received error: test_ffi:ffi_read_int32/2: No permission to write stream `(0xaaaaf4e09a00)' (requested stream has wrong mode) % [34/62] ffi:save_load_int64 .................................................................................................................. **FAILED (0.001 sec) ERROR: [Thread main] /home/mike/swipl-devel/packages/cpp/test_ffi.pl:168: ERROR: [Thread main] test ffi:save_load_int64: received error: test_ffi:ffi_read_int64/2: No permission to write stream `(0xaaaaf4e09c00)' (requested stream has wrong mode) % End unit ffi: **FAILED (0.074 sec CPU) % Start unit: wchar % [43/62] wchar:wchar ............................................................................................................................ passed (0.000 sec) % [44/62] wchar:wchar ............................................................................................................................ passed (0.000 sec) % [45/62] wchar:wchar ............................................................................................................................ passed (0.000 sec) % [46/62] wchar:char_1 ......................................................................................................................... **FAILED (0.000 sec) ERROR: [Thread main] /home/mike/swipl-devel/packages/cpp/test_ffi.pl:256: ERROR: [Thread main] test wchar:char_1: received error: test_ffi:atom_ffi_/2: No permission to read stream `current_output' (requested stream has wrong mode) % End unit wchar: **FAILED (0.004 sec CPU) % Start unit: scan % End unit call: passed (0.014 sec CPU) % 3 tests are blocked (use run_tests/2 with show_blocked(true) for details) ERROR: [Thread main] 4 tests failed % 58 tests passed % Test run completed in 0.136 seconds (0.118 cpu) ERROR: [Thread main] -g test_ffi: false 85/96 Test #88: json:json_schema ................. Passed 0.13 sec Start 89: json:json_rpc ``` ```` ---
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [July 3, 2026, 7:26am UTC](https://swi-prolog.discourse.group/t/errors-and-a-hang-rebuilding/9719/2 "2026-07-03T07:26:46Z")
> [@mike.elston](#): > > I routinely rebuild from source of Ubuntu without problems but today errors and a hang. Thanks for reporting. Both are fixed. I’m trying to clean the 134 open issues. Closed about half and clearly fixed one wrong ☹ Builds and tests again for me. > [@mike.elston](#): > > PS Really sorry to hear of your health challenges. I hope you are putting your recovery ahead of swipl. I surely do. A bit of programming is a good distraction though 🙂 Bad news is that more surgery is needed and it is more serious than hoped for due to complications ☹ ---
**Author:** ![mike.elston](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/mike.elston/32/3691_2.png) [@mike.elston](https://swi-prolog.discourse.group/u/mike.elston)\ **Post date:** [July 3, 2026, 10:01pm UTC](https://swi-prolog.discourse.group/t/errors-and-a-hang-rebuilding/9719/3 "2026-07-03T22:01:40Z")
Thanks Jan. Nearly there - a single failure: 54/96 Test #54: http:proxy …\*\*\*Failed 1.35 sec % Start unit: proxy % [1/13] proxy:Direct connection for TCP … passed (0.342 sec) % [2/13] proxy:All connections via SOCKS … passed (0.052 sec) % [3/13] proxy:Some TCP connections via SOCKS … passed (0.047 sec) % [4/13] proxy:First try SOCKS then fall back to direct … passed (0.051 sec) % [5/13] proxy:First try direct to a nonexistent-host then fall back to SOCKS … passed (0.045 sec) % [6/13] proxy:All TCP connections via HTTP … passed (0.061 sec) % [7/13] proxy:All TCP connections via HTTP but to a non-existent server … passed (0.037 sec) % [8/13] proxy:Request URL directly … passed (0.108 sec) % [9/13] proxy:Request URL when all connections go via SOCKS … passed (0.057 sec) % [10/13] proxy:Request URL when all connections go via HTTP … passed (0.049 sec) % [11/13] proxy:Request invalid URL directly and expect exception rather than failure … passed (0.053 sec) % [12/13] proxy:Request HTTPS url via proxy - should get HTTP CONNECT and not HTTP GET … \*\*FAILED (0.033 sec) ERROR: [Thread main] /home/mike/swipl-devel/packages/http/[test\_proxy.pl:667](http://test_proxy.pl:667): ERROR: [Thread main] test proxy:‘Request HTTPS url via proxy - should get HTTP CONNECT and not HTTP GET’: received error: Unknown error term: proxy\_error(tried([error(proxy(localhost,42217),error(socket\_error(econnrefused,‘Connection refused’),\_1360))-])) % Started server at [http://localhost:41101/](http://localhost:41101/) % Started server at [https://localhost:43265/](https://localhost:43265/) Warning: [Thread main] Unknown message: stop(http\_proxy\_server,error(socket\_error(econnrefused,‘Connection refused’),\_2576)) % [13/13] proxy:Test an exotic application-level proxy - http with authentication … passed (0.037 sec) % End unit proxy: \*\*FAILED (0.386 sec CPU) ERROR: [Thread main] 1 test failed % 12 tests passed % Test run completed in 1.008 seconds (0.397 cpu) ERROR: [Thread main] -g test\_proxy: false ---
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [July 4, 2026, 8:52am UTC](https://swi-prolog.discourse.group/t/errors-and-a-hang-rebuilding/9719/4 "2026-07-04T08:52:17Z")
> [@mike.elston](#): > > 54/96 Test #54: http:proxy …\*\*\*Failed 1.35 sec Incidentally, the http proxy tests fail due to concurrency issues with test port allocation. This was recently improved a little, but there are still opportunities for these tests to fail. Just ignore them …