[GUACAMOLE-1892] Build fails with "undefined reference to 'timer_create'"

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.5.4
• Fix Version/s: 1.5.5
• Component/s: guacamole-server
• Assignee: Unassigned
• Reporter: Mike Jumper
• Created: 11/Dec/23 22:24
• Updated: 12/Jan/24 14:59
• Resolved: 12/Jan/24 14:57

Description

When attempting to build guacamole-server on Ubuntu 20.04.6, the build fails with the following errors:

/usr/bin/ld: .../src/libguac/.libs/libguac.so: undefined reference to `timer_delete'
/usr/bin/ld: .../src/libguac/.libs/libguac.so: undefined reference to `timer_settime'
/usr/bin/ld: .../src/libguac/.libs/libguac.so: undefined reference to `timer_create'

This is because the timer_create(), timer_settime(), and timer_delete() functions are defined in a separate library on Ubuntu 20.04 (librt). A configure test likely needs to be added to recognize whether librt needs to be linked in.

NOTE: Users encountering this error can work around the problem by performing the build with the LDFLAGS environment variable set to "-lrt". For example, when running configure for a fresh build:

LDFLAGS="-lrt" ./configure

Running make, etc. should then succeed as normal.

Issue Links

• is caused by: GUACAMOLE-1846 Race condition can cause the first user for a connection to miss updates
• is duplicated by: GUACAMOLE-1899 Newer Linux distros require librt to be explicitly linked