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 242619 [details]
Created attachment 242887 [details, diff]
Patch to par-1.1.ebuild to add a sed to fix upstream Makefile
The upstream Makefile uses an explicit rule to build par:
$(CC) -o $@ $^
This rule does not include $(LDFLAGS), so the user's LDFLAGS are silently ignored. The attached patch changes the CC to LINK.o, which is a GNU make built in variable defined as:
LINK.o = $(CC) $(LDFLAGS) $(TARGET_ARCH)
With the patch applied, I see my LDFLAGS applied to par.