# grep from osx
pipping@quicksand ~ $ /usr/bin/grep --version
grep (GNU grep) 2.5.1

Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

pipping@quicksand ~ $ /usr/bin/grep --color=always foo <<< foo | od -c
0000000 033   [   0   1   ;   3   1   m   f   o   o 033   [   0   0   m
0000020  \n
0000021

# grep from gentoo prefix, old version
pipping@quicksand ~ $ grep --version
grep (GNU grep) 2.5.1

Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

pipping@quicksand ~ $ grep --color=always foo <<< foo | od -c
0000000 033   [   0   1   ;   3   1   m   f   o   o 033   [   0   0   m
0000020 033   [   K  \n
0000024

# grep from gentoo prefix, new version
pipping@quicksand ~ $ grep --version
GNU grep 2.5.3

Copyright (C) 1988, 1992-2002, 2004, 2005  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

pipping@quicksand ~ $ grep --color=always foo <<< foo | od -c
0000000 033   [   0   1   ;   3   1   m 033   [   K   f   o   o 033   [
0000020   m 033   [   K  \n
0000025


# versions of grep built from source via plain ./configure; make -- no patches

bash-3.2$ ./grep-2.5.1a/src/grep --color=always foo <<< foo | od -c
0000000  033   [   0   1   ;   3   1   m   f   o   o 033   [   0   0   m
0000020   \n
0000021
bash-3.2$ ./grep-2.5.3/src/grep --color=always foo <<< foo | od -c
0000000  033   [   0   1   ;   3   1   m 033   [   K   f   o   o 033   [
0000020    m 033   [   K  \n
0000025
bash-3.2$ ./grep-2.5.4-20080209b/src/grep --color=always foo <<< foo | od -c
0000000  033   [   0   1   ;   3   1   m 033   [   K   f   o   o 033   [
0000020    m 033   [   K  \n
0000025