===================================================================
RCS file: /cvs/mandoc/regress/regress.pl.1,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -p -r1.3 -r1.4
--- mandoc/regress/regress.pl.1	2017/07/18 18:47:06	1.3
+++ mandoc/regress/regress.pl.1	2019/03/06 15:58:11	1.4
@@ -1,4 +1,4 @@
-.\"	$Id: regress.pl.1,v 1.3 2017/07/18 18:47:06 schwarze Exp $
+.\"	$Id: regress.pl.1,v 1.4 2019/03/06 15:58:11 schwarze Exp $
 .\"
 .\" Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
 .\"
@@ -14,7 +14,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: July 18 2017 $
+.Dd $Mdocdate: March 6 2019 $
 .Dt REGRESS.PL 1
 .Os
 .Sh NAME
@@ -145,3 +145,21 @@ The
 subdirectory of the regression suite is not included.
 It uses a Makefile structure that differs vastly from the
 rest of the suite.
+.Sh BUGS
+On Oracle Solaris 11,
+.Xr diff 1
+does not support the
+.Fl a
+option.
+Delete that option from the following line in this script:
+.Pp
+.Dl my @diff = qw(diff -au);
+.Pp
+The C library function
+.Xr wcwidth 3
+is known to be buggy on Solaris, which may cause failures in the
+regression suite, usually because output lines containing affected
+Unicode characters wrap too early.
+.Pp
+The regression suite does not work at all on Solaris 10 or earlier
+because the Perl interpreter provided with those systems is too old.