# Slicer Build Environment Upgraded to \`qt5-almalinux8-gcc14\`

**URL:** <https://discourse.slicer.org/t/slicer-build-environment-upgraded-to-qt5-almalinux8-gcc14/43802>\
**Category:** Development\
**Tags:** python, package, nightlybuild, extensions\
**Created:** [July 22, 2025, 5:19am UTC](https://discourse.slicer.org/t/slicer-build-environment-upgraded-to-qt5-almalinux8-gcc14/43802 "2025-07-22T05:19:42Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Davide\_Punzo](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/davide_punzo/32/66104_2.png) [@Davide\_Punzo](https://discourse.slicer.org/u/Davide_Punzo)\
**Post date:** [August 5, 2025, 8:14am UTC](https://discourse.slicer.org/t/slicer-build-environment-upgraded-to-qt5-almalinux8-gcc14/43802/4 "2025-08-05T08:14:07Z")

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@jcfr I just wanted to report that I have the following issue on:

- OS: Ubuntu 25.04

- Compiler: GCC 14.2.0

- CMake: 3.31.8

- Qt: 5.15.2 (from online installer)

Problem: When launching Slicer, the following error occurs:

./Slicer /home/davide/Development/Slicer/Slicer-SuperBuild-Debug/Slicer-build/bin/./SlicerApp-real: symbol lookup error: /lib/x86\_64-linux-gnu/libtirpc.so.3: undefined symbol: GSS\_C\_NT\_USER\_NAME, version gssapi\_krb5\_2\_MIT

Root Cause: The system’s libtirpc.so.3 library conflicts with Slicer’s built-in GSS/Kerberos libraries, causing a symbol version mismatch.

Working Solutions:

1. Remove Slicer’s GSS library (allows fallback to system library): rm /path/to/Slicer-build/bin/libgssapi\_krb5.so\*

2. Disable GSS API stub during build: cmake -D Slicer\_BUILD\_KRB5\_GSSAPI\_STUB:BOOL=OFF …

Since there’s a working solution for the GSS\_C\_NT\_USER\_NAME symbol lookup error on Ubuntu 25.04, this isn’t a high-priority issue. However, it might be worth documenting this known compatibility issue and its workarounds in the official Slicer build instructions to help other users who encounter the same problem.

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_[View the full topic](https://discourse.slicer.org/t/slicer-build-environment-upgraded-to-qt5-almalinux8-gcc14/43802)._