some error about dovecot when compile

[Magiczero]

when i build dovecot in my computer, something has occured like below:

root at 2030c8624e88:/dovecot-2.3.9# ./autogen.sh
--2019-12-04 10:49:53--  https://www.dovecot.org/tmp/wiki2-export.tar.gz
Resolving www.dovecot.org (www.dovecot.org)... 94.237.12.234, 2a04:3545:1000:720:acc1:5bff:fe5e:4e9
Connecting to www.dovecot.org (www.dovecot.org)|94.237.12.234|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 446263 (436K) [application/x-gzip]
Saving to: 'wiki2-export.tar.gz'

wiki2-export.tar.gz     100%[===============================>] 435.80K   152KB/s    in 2.9s

2019-12-04 10:49:59 (152 KB/s) - 'wiki2-export.tar.gz' saved [446263/446263]

configure.ac:298: warning: macro 'AM_ICONV' not found in library
libtoolize: putting auxiliary files in '.'.
libtoolize: copying file './ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, 'm4'.
libtoolize: copying file 'm4/libtool.m4'
libtoolize: copying file 'm4/ltoptions.m4'
libtoolize: copying file 'm4/ltsugar.m4'
libtoolize: copying file 'm4/ltversion.m4'
libtoolize: copying file 'm4/lt~obsolete.m4'
configure.ac:298: warning: macro 'AM_ICONV' not found in library
configure.ac:22: error: possibly undefined macro: AC_DEFINE
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure.ac:127: error: possibly undefined macro: dnl
configure.ac:298: error: possibly undefined macro: AM_ICONV
configure.ac:429: error: possibly undefined macro: AC_CHECK_HEADER
configure:24018: error: possibly undefined macro: AC_CHECK_LIB
configure:25593: error: possibly undefined macro: AC_CHECK_FUNC
autoreconf: /usr/bin/autoconf failed with exit status: 1

from the information, i think the problem is macro 'AM_ICONV', there are any problem in the setup script? i want you help me to solve this issue. Thank you.

Best
MagicZero

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