Hi Gerald,
It appears that pdfx::PNGImage::PNGImage is missing from liballa.so.
Is that symbol SUPPOSED to be in liballa.so? Or does it reside in another .so?
If it resides in another .so, what does "ldd test_bsd" display? That should tell you if you the loader is finding your liballa.so (or if pdfx::PNGImage::PNGImage resides elsewhere, if that other .so is being found).
HTH, --Eljay