Problems with ptx.1:

Parenthesized comments in command synopsis.  This is impossible
to translate to DocBook.

--- ptx.1-unpatched	2010-07-22 16:30:37.000000000 -0400
+++ ptx.1	2010-07-22 16:31:32.000000000 -0400
@@ -4,7 +4,7 @@
 ptx \- produce a permuted index of file contents
 .SH SYNOPSIS
 .B ptx
-[\fIOPTION\fR]... [\fIINPUT\fR]...   \fI(without -G)\fR
+[\fIOPTION\fR]... [\fIINPUT\fR]...
 .br
 .B ptx
 \fI-G \fR[\fIOPTION\fR]... [\fIINPUT \fR[\fIOUTPUT\fR]]