Build Error

[vos56]

Ubuntu 22.04.5 LTS
Qt version 5.15.3

make -j2
produces this error:
/usr/bin/ld: sstvtx.o: in function sstvTx::create(esstvMode, double)': sstvtx.cpp:(.text+0x5f0): undefined reference to modeBW::modeBW(esstvMode, unsigned int, bool, bool)'
/usr/bin/ld: sstvtx.cpp:(.text+0x620): undefined reference to modeAVT::modeAVT(esstvMode, unsigned int, bool, bool)' /usr/bin/ld: syncprocessor.o: in function syncProcessor::createModeBase()':
syncprocessor.cpp:(.text+0x949): undefined reference to modeBW::modeBW(esstvMode, unsigned int, bool, bool)' /usr/bin/ld: syncprocessor.cpp:(.text+0x9a9): undefined reference to modeAVT::modeAVT(esstvMode, unsigned int, bool, bool)'
collect2: error: ld returned 1 exit status
make: *** [Makefile:978: qsstv] Fehler 1

[FabC]

Both undefined referenced are in the source tree (see sstv/modes), please check the downloaded sources (with git clone or via zip).