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The 'configure' default for 'MAIN_LDFLAGS' has been changed for FreeBSD, NetBSD and Hurd OSes to one more likely to work with compilers other than 'gcc' (FreeBSD 10 defaults to 'clang').
'rchisq(*, df=0, ncp=0)' now returns '0' instead of 'NaN', and 'dchisq(*, df=0, ncp=*)' also no longer returns 'NaN' in limit cases (where the limit is unique). (PR#16521)
'pchisq(*, df=0, ncp > 0, log.p=TRUE)' no longer underflows (for ncp > ~60).