I get this error before the build fails:
gcc -r -keep_private_externs -nostdlib -o .libs/libgstspider.so-master.o 
libgstspider_la-gstspider.lo libgstspider_la-gstspideridentity.lo
libgstspider_la-gstsearchfuncs.lo && gcc -bundle -flat_namespace -undefined
suppress -o .libs/libgstspider.so .libs/libgstspider.so-master.o  -L/sw/lib -lc
ld: multiple definitions of symbol _gst_spider_identity_details
libgstspider_la-gstspider.lo definition of _gst_spider_identity_details in
section (__DATA,__common)
libgstspider_la-gstspideridentity.lo definition of _gst_spider_identity_details
in section (__DATA,__data)
### execution of make failed, exit code 2