Description:
------------
Solution: use [:alpha:] instead a-zA-z in various regular expressions.

Bug:
:/usr/src/php-5.2.9$ export LANG=et_EE.UTF-8
:/usr/src/php-5.2.9$ ./configure --with-curl
configure: error: curl: invalid package name


buggy code part in "configure" script:

    if test -n "`echo $ac_package| sed 's/[-_a-zA-Z0-9]//g'`"; then
      { echo "configure: error: $ac_package: invalid package name" 1>&2; exit 1; }
    fi

bug happens because "Z" isnt the final letter in estonian alphabet.

proof of concept in shell:
:~$ export LANG=en_GB.UTF-8
:~$ echo abcdefghijklmnopqrstuv????ABCDEFGHIJLKMNOPQRSTUV????123456789 |sed 's/[-_[:alpha:]0-9]//g'

:~$ echo abcdefghijklmnopqrstuv????ABCDEFGHIJLKMNOPQRSTUV????123456789 |sed 's/[-_a-zA-Z0-9]//g'

:~$ export LANG=et_EE.UTF-8
:~$ echo abcdefghijklmnopqrstuv????ABCDEFGHIJLKMNOPQRSTUV????123456789 |sed 's/[-_a-zA-Z0-9]//g'
tuv????TUV????
:~$ echo abcdefghijklmnopqrstuv????ABCDEFGHIJLKMNOPQRSTUV????123456789 |sed 's/[-_[:alpha:]0-9]//g'

priitp@vidrik:~$