Install "xcode" from Apple, specifically "gcc" package and BSD SDK;
or install "fink".

You may need newer zlib library, in Mac OS X 10.3, there is very old version
of it.

Make sure you got exec right on configure script and self test shell script:

chmod +x ./configure ./irc_bot/selftest_eval-test-1.sh

Use "--enable-wildcard-bind" argument to "configure" along others.

Run configure. Use "--with-gnutls" for GnuTLS library, or "--with-openssl"
for OpenSSL library, but not both. Use "--without-pthread" to explicitly
disable Posix Threads library (not recommended).
Use "--enable-ipv6" to explicitly enable IPv6 support.

Use CXXFLAGS="-g -O0" to enable debugging support, e.g.:

CXXFLAGS="-g -O0" ./configure --with-openssl --enable-wildcard-bind

Run

make

After successful build, you can run a self-test suite of bot
(strongly recommended):

make check