This patch comes from in-house and this is Solaris specific patch.
neqn, tbl and nroff in groff still need to be installed with g prefix because
ON provides these wrapper scripts. So man pages for these continue to use g prefix.

diff -ruN groff-1.22.3.org/src/preproc/eqn/neqn.man groff-1.22.3/src/preproc/eqn/neqn.man
--- groff-1.22.3.org/src/preproc/eqn/neqn.man	2014-11-04 00:38:35.233523897 -0800
+++ groff-1.22.3/src/preproc/eqn/neqn.man	2016-05-02 23:54:12.452351937 -0700
@@ -1,6 +1,6 @@
-.TH @G@NEQN @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
+.TH GNEQN @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
 .SH NAME
-@g@neqn \- format equations for ascii output
+gneqn \- format equations for ascii output
 .
 .
 .\" license
@@ -27,7 +27,7 @@
 .SH SYNOPSIS
 .\" --------------------------------------------------------------------
 .
-.B @g@neqn
+.B gneqn
 [@g@eqn options]
 .
 .
@@ -36,7 +36,7 @@
 .\" --------------------------------------------------------------------
 .
 The
-.B @g@neqn
+.B gneqn
 program is actually just a shell script which invokes the
 .BR @g@eqn (@MAN1EXT@)
 command with the
diff -ruN groff-1.22.3.org/src/preproc/tbl/tbl.man groff-1.22.3/src/preproc/tbl/tbl.man
--- groff-1.22.3.org/src/preproc/tbl/tbl.man	2014-11-04 00:38:35.221524047 -0800
+++ groff-1.22.3/src/preproc/tbl/tbl.man	2016-05-02 23:55:21.943598161 -0700
@@ -1,7 +1,7 @@
 '\" t
-.TH @G@TBL @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
+.TH GTBL @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
 .SH NAME
-@g@tbl \- format tables for troff
+gtbl \- format tables for troff
 .
 .
 .\" license
@@ -30,7 +30,7 @@
 .SH SYNOPSIS
 .\" --------------------------------------------------------------------
 .
-.SY @g@tbl
+.SY gtbl
 .OP \-Cv
 .RI [ files\~ .\|.\|.]
 .YS
@@ -845,7 +845,7 @@
 .
 .LP
 Note that
-.B @g@tbl
+.B gtbl
 computes the column widths line by line, applying \[rs]w on each entry
 which isn\[aq]t a text block.
 .
@@ -1003,7 +1003,7 @@
 .SH "INTERACTION WITH @G@EQN"
 .\" --------------------------------------------------------------------
 .
-.BR @g@tbl (@MAN1EXT@)
+.BR gtbl (@MAN1EXT@)
 should always be called before
 .BR @g@eqn (@MAN1EXT@)
 .RB ( groff (@MAN1EXT@)
@@ -1034,12 +1034,12 @@
 .
 .
 .LP
-.B @g@tbl
+.B gtbl
 uses register, string, macro and diversion names beginning with the digit\~\c
 .BR 3 .
 .
 When using
-.B @g@tbl
+.B gtbl
 you should avoid using any names beginning with a\~\c
 .BR 3 .
 .
@@ -1049,7 +1049,7 @@
 .\" --------------------------------------------------------------------
 .
 Since
-.B @g@tbl
+.B gtbl
 defines its own macros (right before each table) it is necessary to use
 an \[oq]end-of-macro\[cq] macro.
 .
@@ -1075,16 +1075,16 @@
 .
 .LP
 Note, however, that not all features of
-.B @g@tbl
+.B gtbl
 can be wrapped into a macro because
-.B @g@tbl
+.B gtbl
 sees the input earlier than
 .BR @g@troff .
 .
 For example, number formatting with vertically aligned decimal points
 fails if those numbers are passed on as macro parameters because
 decimal point alignment is handled by
-.B @g@tbl
+.B gtbl
 itself: It only sees \[oq]\[rs]$1\[cq], \[oq]\[rs]$2\[cq], etc., and
 therefore can\[aq]t recognize the decimal point.
 .
diff -ruN groff-1.22.3.org/src/roff/nroff/nroff.man groff-1.22.3/src/roff/nroff/nroff.man
--- groff-1.22.3.org/src/roff/nroff/nroff.man	2014-11-04 00:38:35.526520234 -0800
+++ groff-1.22.3/src/roff/nroff/nroff.man	2016-05-02 23:56:10.581654158 -0700
@@ -1,6 +1,6 @@
-.TH @G@NROFF @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
+.TH GNROFF @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
 .SH NAME
-@g@nroff \- emulate nroff command with groff
+gnroff \- emulate nroff command with groff
 .
 .
 .\" --------------------------------------------------------------------
@@ -38,7 +38,7 @@
 .    RB "[" "\\$1" "]"
 ..
 
-.SY @g@nroff
+.SY gnroff
 .OP \-CchipStUvwW
 .OP \-d cs
 .OP \-M dir
@@ -49,10 +49,10 @@
 .OP \-T name
 .RI [ file\~ .\|.\|.]
 .
-.SY @g@nroff
+.SY gnroff
 .B \-\-help
 .
-.SY @g@nroff
+.SY gnroff
 .B \-v
 |
 .B \-\-version
@@ -63,7 +63,7 @@
 .\" --------------------------------------------------------------------
 .
 The
-.B @g@nroff
+.B gnroff
 script emulates the
 .B nroff
 command using groff.
@@ -86,7 +86,7 @@
 .B \-T
 command line option (which overrides the environment variable)
 specifies a (valid) device,
-.B @g@nroff
+.B gnroff
 checks the current locale to select a default output device.
 .
 It first tries the
@@ -131,7 +131,7 @@
 .BR @g@troff (@MAN1EXT@).
 .
 In addition,
-.B @g@nroff
+.B gnroff
 silently ignores the options
 .BR \-e ,
 .BR \-q ,