An old iconv (GNU libiconv 1.11) does not know about utf8, it does know
UTF-8 though, which is also understood by all newer iconv implementations.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
---

2009/5/12 Junio C Hamano <gitster@pobox.com>:
> --- a/t/t3900-i18n-commit.sh
> +++ b/t/t3900-i18n-commit.sh
> @@ -9,7 +9,15 @@ test_description='commit and log output encodings'
>
>  compare_with () {
>        git show -s $1 | sed -e '1,/^$/d' -e 's/^    //' >current &&
> -       test_cmp current "$2"
> +       case "$3" in
> +       '')
> +               test_cmp "$2" current ;;
> +       ?*)
> +               iconv -f "$3" -t utf8 >current.utf8 <current &&
> +               iconv -f "$3" -t utf8 >expect.utf8 <"$2" &&

I happen to have an old one (Cygwin):
$ iconv --version
iconv (GNU libiconv 1.11)

 t/t3900-i18n-commit.sh |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/t/t3900-i18n-commit.sh b/t/t3900-i18n-commit.sh
index 5dbbcb6..b4ec2b5 100755
--- a/t/t3900-i18n-commit.sh
+++ b/t/t3900-i18n-commit.sh
@@ -13,8 +13,8 @@ compare_with () {
 	'')
 		test_cmp "$2" current ;;
 	?*)
-		iconv -f "$3" -t utf8 >current.utf8 <current &&
-		iconv -f "$3" -t utf8 >expect.utf8 <"$2" &&
+		iconv -f "$3" -t UTF-8 >current.utf8 <current &&
+		iconv -f "$3" -t UTF-8 >expect.utf8 <"$2" &&
 		test_cmp expect.utf8 current.utf8
 		;;
 	esac
-- 
1.6.3.49.ge312c