Some warnings from the compiler

[Bjarni Ingi Gislason]

                           Groff Bug Report

GROFF VERSION:
groff-current (from about 24th February 2012)

MACHINE:
Laptop, i586, AMD K6

OS:
Debian GNU/Linux, linux 2.6.32-41

COMPILER:
g++ (Debian 4.4.5-8) 4.4.5

INPUT FILES:
  Files to compile in groff-current

COMMAND LINE:

CFLAGS='-Wall -Wextra -Wformat=2 -Wstrict-prototypes -g -fno-common 
-funsigned-char'
CXXFLAGS=$(echo "$CFLAGS" | sed -e 's/-Wstrict-prototypes//' )
./configure CFLAGS="$CFLAGS"  CXXFLAGS="$CXXFLAGS"

make

DESCRIPTION OF INCORRECT BEHAVIOUR:
  Warnings from compiler:

getopt.c: In function '_getopt_initialize':
getopt.c:252: warning: unused parameter 'argc'
getopt.c:252: warning: unused parameter 'argv'

version.cpp:3: warning: 'Version_string' initialized and declared 'extern'

number.cpp:358: warning: comparison between signed and unsigned integer 
expressions

main.cpp:122: warning: 'sccsid' defined but not used

pre-html.cpp:1208: warning: suggest explicit braces to avoid ambiguous 'else'