Comment # 6 on bug 1193191 from Martin Li������ka

The linker command looks like:
[   10s] /usr/bin/c++ -fPIC -O2 -Wall -D_FORTIFY_SOURCE=2
-fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables
-fstack-clash-protection -Werror=return-type  -g -DNDEBUG -std=c++11
-DBUILDING_DLL=1 -O2 -g -DNDEBUG  -Wl,--as-needed -Wl,--no-undefined -Wl,-z,now
-shared -Wl,-soname,ssh2-api-1.1.qmod -o ssh2-api-1.1.qmod
CMakeFiles/ssh2.dir/src/SFTPClient.cpp.o
CMakeFiles/ssh2.dir/src/SSH2Channel.cpp.o
CMakeFiles/ssh2.dir/src/SSH2Client.cpp.o
CMakeFiles/ssh2.dir/src/ssh2-module.cpp.o
CMakeFiles/ssh2.dir/QC_SFTPClient.cpp.o CMakeFiles/ssh2.dir/QC_SSH2Base.cpp.o
CMakeFiles/ssh2.dir/QC_SSH2Channel.cpp.o
CMakeFiles/ssh2.dir/QC_SSH2Client.cpp.o  -lssh2 

as seen, it very likely misses -lqore_library_or_what.