view tests/test-issue612.out @ 8311:e0eb03bfa5af

manpage build: fail early when xmlto is not available

When we try to build manpages with xmlto and sed, but xmlto is
missing fail at the xmlto stage.  Otherwise, one may run `cd doc;
make' and miss the warnings like:

  xmlto: not found
  sed: hg.1: No such file or directory

and end up with empty files installed as manpages.

adding src/a.c
moving src/a.c to source/a.c
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
created new head
? src/a.o
merging src/a.c and source/a.c to source/a.c
1 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
M source/a.c
R src/a.c
? source/a.o