K 10
svn:author
V 7
linimon
K 8
svn:date
V 27
2019-11-24T05:40:55.811852Z
K 7
svn:log
V 321
MFH: r518294

Prevent failure deep in the build if dtrace is not installed:

  dtrace_cython/consumer.c:611:10: fatal error: 'sys/dtrace.h' file not found

Present a more informative message instead.

This affects (only some?) of the package building machines, e.g., for
powerpc64.

Approved by:	portmgr (tier-2 blanket)

END