OpenLDAP and Ldap2radius Compile problem

[mehrdad4]

As this Instructions of ldap2radius for openldap from this url: LDAp2Radius
with this instructions:
1 Building and installing
=========================

Build dependencies:
- Flex http://www.gnu.org/software/flex/
- Bison http://www.gnu.org/software/bison/bison.html
- libradius http://portal-to-web.de/tacacs
- OpenLDAP http://www.openldap.org

To build and install, just run
./configure && make && make installI get this error in last step exactly when make:
cc -g -O2 -DCF_FILE=\"/usr/local/etc/ldap2radius.conf\" -c -o ldap2radius.o ldap2radius.c
ldap2radius.c: In function main:
ldap2radius.c:94: warning: assignment makes pointer from integer without a cast
ldap2radius.c: In function ldif_parse:
ldap2radius.c:259: warning: assignment makes pointer from integer without a cast
ldap2radius.c: In function parse_line:
ldap2radius.c:324: warning: return makes integer from pointer without a cast
ldap2radius.c:334: warning: return makes integer from pointer without a cast
cc -g -O2 -DCF_FILE=\"/usr/local/etc/ldap2radius.conf\" -c -o cf.o cf.c
bison -y cfparser.y
mv y.tab.c cfparser.c
flex -ocflexer.c cflexer.l
cc -g -O2 -DCF_FILE=\"/usr/local/etc/ldap2radius.conf\" -c -o cfparser.o cfparser.c
cc -o ldap2radius -lradius
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status
make: *** [ldap2radius] Error 1


please help
how can I make this?