/tmp/ccm1Vh6N.o: In function `main':
foo.cc:(.text.startup+0xa1): undefined reference to `SeqList::SeqList()'
foo.cc:(.text.startup+0xcc): undefined reference to `SeqList::~SeqList()'
foo.cc:(.text.startup+0xe7): undefined reference to `SeqList::~SeqList()'
collect2: error: ld returned 1 exit status