Error lr_syntax.c:19 FreeBSD 8.0 i386

[QuZ]

web# make -f BSDmakefile install

Code:

#
# Preparing ISPCP System Directory and files
#
cd ./tools && make install
(cd ./daemon;  make ispcp_daemon;)
cc -O2 -pipe  -c lr_syntax.c
lr_syntax.c:19: error: conflicting types for 'readlink'
/usr/include/unistd.h:406: error: previous declaration of 'readlink' was here
*** Error code 1

Stop in /usr/src/syssrc/ispcp/ispcp-omega-1.0.0/tools/daemon.
*** Error code 1

Stop in /usr/src/syssrc/ispcp/ispcp-omega-1.0.0/tools.
*** Error code 1

Stop in /usr/src/syssrc/ispcp/ispcp-omega-1.0.0.
web#

Why?