/sbin/grub is always built and grub.8 is produced automatically

docs/grub.8

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+.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.010.
+.TH GRUB "8" "June 2000" "GNU GRUB 0.5.92" "FSF"
+.SH NAME
+GRUB \- the stage2 emulator shell
+.SH SYNOPSIS
+.B GRUB
+[\fIOPTION\fR]...
+.SH DESCRIPTION
+.PP
+Enter the GRand Unified Bootloader command shell.
+.TP
+\fB\-\-batch\fR
+turn on batch mode for non-interactive use
+.TP
+\fB\-\-boot\-drive\fR=\fIDRIVE\fR
+specify stage2 boot_drive [default=0x0]
+.TP
+\fB\-\-config\-file\fR=\fIFILE\fR
+specify stage2 config_file [default=/boot/grub/menu.lst]
+.TP
+\fB\-\-help\fR
+display this message and exit
+.TP
+\fB\-\-hold\fR
+wait until a debugger will attach
+.TP
+\fB\-\-install\-partition\fR=\fIPAR\fR
+specify stage2 install_partition [default=0x20000]
+.TP
+\fB\-\-no\-config\-file\fR
+do not use the config file
+.TP
+\fB\-\-no\-curses\fR
+do not use curses
+.TP
+\fB\-\-read\-only\fR
+do not write anything to devices
+.TP
+\fB\-\-verbose\fR
+print verbose messages
+.TP
+\fB\-\-version\fR
+print version information and exit
+.SH "REPORTING BUGS"
+Report bugs to bug-grub@gnu.org
+.SH "SEE ALSO"
+The full documentation for
+.B GRUB
+is maintained as a Texinfo manual.  If the
+.B info
+and
+.B GRUB
+programs are properly installed at your site, the command
+.IP
+.B info GRUB
+.PP
+should give you access to the complete manual.