[Solved] Compiling fails -- libgomp.so "missing"

[paulmatth (Paul Matthijsse)]

Just for info. I installed Xubuntu 24.04 last week and today I recompiled RawTherapee. Everything went fine untel 99%, then ld complained that the package libgomp.so was missing.

[ 98%] Building CXX object rtgui/CMakeFiles/rth.dir/xtransprocess.cc.o
[ 99%] Building CXX object rtgui/CMakeFiles/rth.dir/xtransrawexposure.cc.o
make[2]: *** Er is geen regel om doel '/usr/lib/gcc/x86_64-linux-gnu/11/libgomp.so' te maken, nodig voor 'rtgui/rawtherapee'.  Gestopt.
make[2]: *** Wachten op onvoltooide taken...
[ 99%] Building CXX object rtgui/CMakeFiles/rth.dir/zoompanel.cc.o
make[1]: *** [CMakeFiles/Makefile2:191: rtgui/CMakeFiles/rth.dir/all] Fout 2
make: *** [Makefile:136: all] Fout 2

So I searched for this folder: /usr/lib/gcc/x86_64-linux-gnu/11 but that didn’t exist. Instead there was a subfolder 13 and that one contained libgomp.so.

A quick workaround was to create the directory “11” next to 13 and to copy the contents of 13 to 11. Now RT compiles fine.

I also tried to change line 2697 in the file apps/rawtherapee/rtgui/CMakeFiles/rth.dir from 11 to 13 but that didn’t work.

I have no idea if this is only related to Xubuntu 24.04, or that it affects other newer distros as well.

Regards, Paul.

[tankist02]

I have libgomp packaged installed on Fedora 40 and RT compiles fine:

$ rpm -qa|grep gomp
libgomp-14.1.1-4.fc40.x86_64

[Lawrence37]

Was it a clean build? If not, re-run the configure step and try compiling again. Alternatively, delete the build folder and start fresh. Library errors are usually the result of updating the system without re-configuring. The configure step finds the libraries.

[paulmatth (Paul Matthijsse)]

Hello, I did a reconfigure before compiling but that resulted in named error above.

A fresh install, starting with “git clone”, did the trick however.

Thanks for your help.

[kofa (István Kovács)]

You can use

git clean -d -x -f

or

git clean -dxf

to reset the working space to what’s in the repo, removing all generated files (everything that is not in the repo).

[paulmatth (Paul Matthijsse)]

Thanks @kofa. In fact it’s the second time that you tell me this, but I forgot!

[Solved] Xubuntu 20 > 22.04 - compile error ART and RT

You may be able to avoid that ‘start from scratch’ by telling git it should remove all files that are not present in the git repo (such as artefacts from previous builds). I do that all the time before compiling darktable, and the practice has served me well. This should do it: git clean -d -f -x

It’s added now to my “how to compile” notes.