Hello, bison-3.1.90 does not build on (my) linux because (at least) clock_gettime() is not found in any library given.
It seems that LIB_CLOCK_GETTIME and LIB_GETHRXTIME are both correctly assigned to -lrt but nobody uses these macros. Using (in Makefile.in): src_bison_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME) $(LIB_GETHRXTIME) clears the problem. Regards, Denis Excoffier. P.S. Seen the new 3.1.91 but not tested. Seems (by inspection and diff'ing) that the problem is still here though.