bopm make error

bopm version 3.1.2
gcc version 4.0.2
Running on Debian Etch Linux

I ran ./configure and it configured fine, then I ran make and I got the
following errors:

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USER@HOSTNAME:~/bopm-3.1.2$ make
Making all in src
make[1]: Entering directory `/home/ircadmin/bopm-3.1.2/src'
make  all-recursive
make[2]: Entering directory `/home/ircadmin/bopm-3.1.2/src'
Making all in libopm
make[3]: Entering directory `/home/ircadmin/bopm-3.1.2/src/libopm'
Making all in src
make[4]: Entering directory `/home/ircadmin/bopm-3.1.2/src/libopm/src'
make  all-am
make[5]: Entering directory `/home/ircadmin/bopm-3.1.2/src/libopm/src'
source='config.c' object='config.lo' libtool=yes \
depfile='.deps/config.Plo' tmpdepfile='.deps/config.TPlo' \
depmode=gcc3 /bin/bash ../depcomp \
/bin/bash ../libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I.     -g
-O2 -c -o config.lo `test -f 'config.c' || echo './'`config.c
rm -f .libs/config.lo
gcc -DHAVE_CONFIG_H -I. -I. -I. -g -O2 -c config.c -MT config.lo -MD -MP -MF
.deps/config.TPlo  -fPIC -DPIC -o .libs/config.lo
config.c: In function 'libopm_config_create':
config.c:93: error: invalid lvalue in assignment
config.c:97: error: invalid lvalue in assignment
config.c:102: error: invalid lvalue in assignment
config.c: In function 'libopm_config_set':
config.c:191: error: invalid lvalue in assignment
make[5]: *** [config.lo] Error 1
make[5]: Leaving directory `/home/ircadmin/bopm-3.1.2/src/libopm/src'
make[4]: *** [all] Error 2
make[4]: Leaving directory `/home/ircadmin/bopm-3.1.2/src/libopm/src'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/home/ircadmin/bopm-3.1.2/src/libopm'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/ircadmin/bopm-3.1.2/src'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/ircadmin/bopm-3.1.2/src'
make: *** [all-recursive] Error 1
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Does anyone know how I can fix this error?
Thanks.