See attached build log.
(Please do not complain about the need for looking at the build log until you can provide an easy way to open bugs with the correct data picked out of a tinderbox log. Thanks.)
Created attachment 242613 [details]
The upstream Makefile.am assigns an explicit value to gltron_LINK, presumably to ensure that the link is done using $CXX instead of $CCLD, which is normally the same as $CC. However, the assigned link line is incomplete. It omits flag references that the default automake LINK variable uses:
LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@
gltron_LINK = $(CXX) -o $@
Presumably, adding the missing flags to the gltron_LINK in Makefile.am and regenerating Makefile.in would fix this problem.