Build Error on Fedora 40

[ycollet]

I am trying to build Fire 1.0.1 on Fedora 40 using gcc-14.1.1.
I met an error during link:

/usr/bin/ld: /tmp/ccyXj6FF.ltrans43.ltrans.o: in function `FireAudioProcessorEditor::~FireAudioProcessorEditor()':
/builddir/build/BUILD/Fire/Source/PluginEditor.cpp:184:(.text+0x321a): undefined reference to `SpectrumBackground::~SpectrumBackground()'
/usr/bin/ld: /tmp/ccyXj6FF.ltrans43.ltrans.o: in function `FireAudioProcessorEditor::FireAudioProcessorEditor(FireAudioProcessor&)':
/builddir/build/BUILD/Fire/Source/PluginEditor.cpp:17:(.text+0x502d): undefined reference to `SpectrumBackground::SpectrumBackground()'
/usr/bin/ld: /builddir/build/BUILD/Fire/Source/PluginEditor.cpp:169:(.text.unlikely+0x154): undefined reference to `SpectrumBackground::~SpectrumBackground()'
collect2: error: ld returned 1 exit status