I presume you're following README.symbian, and are at step (3).

Looking at symbian/config.pl:

my $WIN = $ENV{WIN} ; # 'wins', 'winscw' (from sdk.pl)
my $ARM = 'thumb';    # 'thumb', 'armv5'
my $S60SDK = $ENV{S60SDK}; # qw(1.2 2.0 2.1 2.6) (from sdk.pl)
    if ($SDK_VARIANT eq 'S60' && $S60SDK =~ /^5\./) {
        $ARM = 'armv5';    # 'thumb', 'armv5' # Configuration for S60 
+5th Edition SDK v1.0
    }
my $S80SDK = $ENV{S80SDK}; # qw(2.0) (from sdk.pl)
my $S90SDK = $ENV{S90SDK}; # qw(1.1) (from sdk.pl)
my $UIQSDK = $ENV{UIQSDK}; # qw(2.0 2.1) (from sdk.pl)

my $UREL = $ENV{UREL}; # from sdk.pl
$UREL =~ s/-ARM-/$ARM/;
my $UARM = $ENV{UARM}; # from sdk.pl

die "$0: SDK not recognized\n"
  if !defined($SYMBIAN_VERSION) ||
     !defined($SDK_VERSION) ||
     (!defined($S60SDK) && !defined($S80SDK) && !defined($S90SDK) && !
+defined($UIQSDK));
[download]

So it seems taht your environment is not set up as config.pl expects.

Thank's for your reply Corion, i've seen the file sdk.pl to solve this issue but i don't understand about the cheat sheet for the right S60/S80 SDK settings. This is part of line from sdk.pl:

[ $SYMBIAN_ROOT, $SYMBIAN_VERSION, $SDK_NAME, $SDK_VARIANT, $SDK_VERSI
+ON ];

# The following is a cheat sheet for the right S60/S80 SDK settings.
#
# symbiancommon.bat:
# set EPOC_BIN=%EPOCROOT%Epoc32\gcc\bin;%EPOCROOT%Epoc32\Tools
# set MWCW=C:\Program Files\Metrowerks\CodeWarrior for Symbian OEM v2.
+8
# set MSVC=C:\Program Files\Microsoft Visual Studio
# set MSVC_BIN=%MSVC%\VC98\Bin;%MSVC%\Aux\MSDev98\Bin
# set MSVC_INC=%MSVC%\VC98\atl\include;%MSVC%\VC98\include;%MSVC%\mfc\
+include;%MSVC%\include
# set MSVC_LIB=%MSVC%\mfc\lib;%MSVC%\lib
#
# s60-2.0-cw:
#
# set EPOCROOT=\Symbian\7.0s\Series60_v20_CW\
# set EPOCDEVICE=Series60_2_0_CW:com.Nokia.Series60_2_0_CW
# symbiancommon
# set PATH=%EPOC_BIN%;%MWCW%\Bin;%MWCW%\Symbian_Tools\Command_Line_Too
+ls;%MSVC_BIN%;C:\perl\bin;C:\winnt\system32
# set USERDEFS=%USERDEFS% -D__SERIES60_20__ -D__SERIES60_MAJOR__=2 -D_
+_SERIES60_MINOR__=0 -D__SERIES60_2X__
# 
# s60-2.0-vc:
#
# set EPOCROOT=\Symbian\7.0s\Series60_v20\
# set EPOCDEVICE=Series60_v20:com.nokia.series60
# symbiancommon
# set PATH=%EPOC_BIN%;%MSVC_BIN%;C:\perl\bin;C:\winnt\system32
# set INCLUDE=%MSVC_INC%
# set LIB=%MSVC_LIB%
# set USERDEFS=%USERDEFS% -D__SERIES60_20__ -D__SERIES60_MAJOR__=2 -D_
+_SERIES60_MINOR__=0 -D__SERIES60_2X__
# 
# s60-2.1-cw:
#
# set EPOCROOT=\Symbian\7.0s\Series60_v21_CW\
# set EPOCDEVICE=Series60_v21_CW:com.Nokia.series60
# symbiancommon
# set PATH=%EPOC_BIN%;%MWCW%\Bin;%MWCW%\Symbian_Tools\Command_Line_Too
+ls;%MSVC_BIN%;C:\perl\bin;C:\winnt\system32
# set USERDEFS=%USERDEFS% -D__SERIES60_21__ -D__SERIES60_MAJOR__=2 -D_
+_SERIES60_MINOR__=1 -D__SERIES60_2X__
#
[download]

I want to know if my environment is not same as like on config.pl, so is there anything i must to do on file sdk.pl or file sdk.pl must not change at all. Sorry about this and i'm very curious about this, thank's a lot.

I haven't tried to build Perl for Symbian. I guess you have to set the appropriate environment variables, depending on the version of SDK you have installed and th eC compiler suite you have.