[sylpheed:32626] iconv problem?

[q crazycode]

after a long time of compiling the code, thers is a new error,
here is the info:

gcc -g -O2 -mms-bitfields -mwindows -o sylpheed.exe main.o mainwindow.o
folderview.o summaryview.o messageview.o headerview.o textview.o imageview.o
mimeview.o quick_search.o query_search.o message_search.o colorlabel.o
action.o compose.o gtkshruler.o menu.o stock_pixmap.o prefs_ui.o
prefs_common_dialog.o prefs_filter.o prefs_filter_edit.o
prefs_account_dialog.o prefs_folder_item.o prefs_display_items.o
prefs_display_header.o prefs_customheader.o prefs_summary_column.o
prefs_template.o prefs_actions.o prefs_search_folder.o prefs_toolbar.o
account_dialog.o template.o addressbook.o addr_compl.o addritem.o
addrcache.o addrbook.o addrindex.o mgutils.o vcard.o ldif.o importldif.o
importcsv.o jpilot.o syldap.o editbook.o editgroup.o editaddress.o
editvcard.o editjpilot.o editldap.o editldap_basedn.o addressadd.o filesel.o
foldersel.o statusbar.o logwindow.o sourcewindow.o manage_window.o undo.o
alertpanel.o inputdialog.o progressdialog.o subscribedialog.o about.o
setup.o gtkutils.o send_message.o inc.o import.o export.o rfc2015.o
passphrase.o select-keys.o sigstatus.o simple-gettext.o manual.o
eggtrayicon.o trayicon.o printing.o sslmanager.o quote_fmt_lex.o
quote_fmt_parse.o sylpheed-marshal.o -Wl,-luuid sylpheed.res  -Lf:/mingw/lib
-lgtk-win32-2.0 -lgdk-win32-2.0 -limm32 -lshell32 -lole32 -latk-1.0
-lgdk_pixbuf-2.0 -lpangocairo-1.0 -lcairo -lpangoft2-1.0 -lpangowin32-1.0
-lgdi32 -lfreetype -lz -lfontconfig -lpango-1.0 -lgobject-2.0 -lgmodule-2.0
f:/mingw/lib/libiconv.dll.a ../libsylph/.libs/libsylph.a -lglib-2.0 -lintl
-lws2_32 -lssl32 -leay32 -Lf:/mingw/lib -Lf:/mingw/lib
../libsylph/.libs/libsylph.a(codeconv.o)(.text+0x1213): In function
`conv_iconv_strdup_with_cd':
F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/codeconv.c:1542:
undefined reference to `libiconv'
../libsylph/.libs/libsylph.a(codeconv.o)(.text+0x12e7):F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/codeconv.c:1554:
undefined reference to `libiconv'
../libsylph/.libs/libsylph.a(codeconv.o)(.text+0x1451): In function
`conv_sjistoutf8':
F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/codeconv.c:783:
undefined reference to `libiconv_open'
../libsylph/.libs/libsylph.a(codeconv.o)(.text+0x1470):F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/codeconv.c:785:
undefined reference to `libiconv_open'
../libsylph/.libs/libsylph.a(codeconv.o)(.text+0x1541): In function
`conv_euctoutf8':
F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/codeconv.c:812:
undefined reference to `libiconv_open'
../libsylph/.libs/libsylph.a(codeconv.o)(.text+0x1560):F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/codeconv.c:814:
undefined reference to `libiconv_open'
../libsylph/.libs/libsylph.a(codeconv.o)(.text+0x17f7): In function
`conv_utf8tosjis':
F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/codeconv.c:863:
undefined reference to `libiconv_open'
../libsylph/.libs/libsylph.a(codeconv.o)(.text+0x1816):F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/codeconv.c:865:
more undefined references to `libiconv_open' follow
../libsylph/.libs/libsylph.a(codeconv.o)(.text+0x1bec): In function
`conv_iconv_strdup':
F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/codeconv.c:1480:
undefined reference to `libiconv_close'
../libsylph/.libs/libsylph.a(imap.o)(.text+0x3cb4): In function
`imap_modified_utf7_to_utf8':
F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/imap.c:4207:
undefined reference to `libiconv'
../libsylph/.libs/libsylph.a(imap.o)(.text+0x3ce4):F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/imap.c:4216:
undefined reference to `libiconv'
../libsylph/.libs/libsylph.a(imap.o)(.text+0x3d1d):F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/imap.c:4163:
undefined reference to `libiconv_open'
../libsylph/.libs/libsylph.a(imap.o)(.text+0x4ffc): In function
`imap_utf8_to_modified_utf7':
F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/imap.c:4278:
undefined reference to `libiconv'
../libsylph/.libs/libsylph.a(imap.o)(.text+0x502a):F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/imap.c:4287:
undefined reference to `libiconv'
../libsylph/.libs/libsylph.a(imap.o)(.text+0x50e3):F:/msys/1.0/home/Administrator/sylpheed-2.5.0/libsylph/imap.c:4237:
undefined reference to `libiconv_open'
collect2: ld returned 1 exit status
make[3]: *** [sylpheed.exe] Error 1
make[3]: Leaving directory `/home/Administrator/sylpheed-2.5.0/src'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/Administrator/sylpheed-2.5.0/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/Administrator/sylpheed-2.5.0'
make: *** [all-recursive-am] Error 2
How can I do next?