It also concerns libSBML-5.19.0
The fix is simple: in src/bindings/perl/CMakeLists.txt, line 233, replace set(PERL_PACKAGE_INSTALL_BIN_DIR ${PERL_PACKAGE_INSTALL_DIR}/auto/libSBML) by set(PERL_PACKAGE_INSTALL_BIN_DIR ${PERL_PACKAGE_INSTALL_DIR}/auto/LibSBML)
Misname for Perl .so binding folder
Right, easier
Currently I found another temporary way to get the geneProductAssociation with $fbcReaction->getGeneProductAssociation()->toXMLNode()->getChild(0)->toXMLString(); Then I parse the XML
Other methods to get fbc values work
getAssociation() of reaction fbc:geneProductAssociation fails with Perl binding
libSBML Example Program page for printSupported.pl is broken