conflicting types for 'bdb_db

I was trying to compile openladp 2.2.23 on a Solaris 9 /X86 machine. The configure and make depend worked fine, however, when I tried to run make, it ended with the following error messages:

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gcc -g -O2 -I../../../include -I../../../include -I.. -I./.. -I/usr/local/include -I/usr/local/BerkeleyDB.4.3/include -I/usr/local/ssl/include -I/usr/local/ssl/include/openssl -I/usr/local/include/sasl -c config.c -fPIC -DPIC -o .libs/config.lo
config.c:36: error: conflicting types for 'bdb_db_config'
external.h:54: error: previous declaration of 'bdb_db_config' was here
config.c:36: error: conflicting types for 'bdb_db_config'
external.h:54: error: previous declaration of 'bdb_db_config' was here
make[3]: *** [config.lo] Error 1
make[3]: Leaving directory `/usr/local/source/openldap-2.2.17/servers/slapd/back-bdb'
make[2]: *** [.backend] Error 1
make[2]: Leaving directory `/usr/local/source/openldap-2.2.17/servers/slapd'
make[1]: *** [all-common] Error 1
make[1]: Leaving directory `/usr/local/source/openldap-2.2.17/servers'
make: *** [all-common] Error 1
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The configure options I used:

./configure --enable-wrappers --enable-bdb --enable-perl --enable-ldap --enable
-rlookups --with-tls --with-cyrus-sasl --with-gnu-ld --enable-crypt --enable-per
l --enable-shell

The environment variables were set in configure file:

CC=gcc
CPPFLAGS="-I/usr/local/include -I/usr/local/BerkeleyDB.4.3/include -I/usr/local/
ssl/include -I/usr/local/ssl/include/openssl -I/usr/local/include/sasl"
LDFLAGS="-L/usr/local/lib -L/usr/local/BerkeleyDB.4.3/lib -R/usr/local/lib -R/us
r/local/BerkeleyDB.4.3/lib -L/usr/local/ssl/lib -L/usr/local/lib/sasl2"
export CPPFLAGS LDFLAGS

Other software, such as BerkeleyDB, openssl, cyrus-sasl were built and installed just fine. The version of gcc I was using is 3.4.3

Any help will be highly appreciated.