Jenkins nightly-builds pipeline is red for 3.7.x:
00:01:46.029 (cd libpromises && /usr/bin/make top_distdir=../cfengine-3.7.0b1.2634dc9 distdir=../cfengine-3.7.0b1.2634dc9/libpromises \
00:01:46.029 am_remove_distdir=: amskip_length_check=: am_skip_mode_fix=: distdir)
00:01:46.052 make: *** No rule to make target `failsafe.cf', needed by `bootstrap.inc'. Stop.
00:01:46.054 make: *** [distdir] Error 1
It seems @failsafe.cf@ is missing from the source tarball.