I'm trying to compile Hypermail 2.2.0 on Mac OS X Tiger (Intel
Macbook). I have run configure without any errors, but when I try to
compile it with make the following error occurred:

gcc -c -g -O2 -Ipcre -DTRIO_MINIMAL base64.c
In file included from hypermail.h:384,
from base64.c:15:
proto.h:99: error: conflicting types for 'strcasestr'
/usr/include/string.h:88: error: previous declaration of 'strcasestr'
was here
make[1]: *** [base64.o] Error 1
make: *** [hypermail] Error 2

Any suggestions what I can do to fix the problem?

Kind regards
Tom