the build of xorg-server (1.20.7) with dtrace enabled fails on FreeBSD
There are errors in:
configure.ac line 1483
OS_LIB='$(top_builddir)/os/os.O $(SHA1_LIBS) $(DLOPEN_LIBS) $(LIBUNWIND_LIBS)'
the *_LIBS are unnecessary and wrong here (they finally pop up as dependencies of the Xorg target)
and dix/Makefile.am line 67: the dtrace-dix.o is created but omitted from the link step.
With the two details fixed the xorg-server builds cleanly and the Xserver provider works.