Building Bitcoin 0.3

I tried building it myself but it didn't compile.
Which ports did you use?
I tried with wxgtk28-unicode and db42-4.2.52_5 & db50-5.0.21.0
Here the latest attempt:
nagilum@cakebox ~/src > uname -a
FreeBSD cakebox.tis 8.1-PRERELEASE FreeBSD 8.1-PRERELEASE #0: Tue Jun 29 22:25:46 CEST 2010 root@cakebox.tis:/usr/obj/export/src/sys/net5501 i386
nagilum@cakebox ~/src > gmake -f makefile.unix
g++45 -c -O2 -Wno-invalid-offsetof -Wformat -g -D__WXDEBUG__ -D__WXGTK__ -DNOPCH -I"/usr/include" -I"/usr/local/include" -I"/usr/local/include/wx-2.8" -I"/usr/local/lib/wx/include/gtk2-unicode-release-2.8" -I"/usr/local/include/db50" -o headers.h.gch headers.h
In file included from headers.h:108:0:
ui.h:13:142: error: default argument for 'const wxString& caption' has type 'const char [8]'
ui.h: In function 'int MyMessageBox(const wxString&, const wxString&, int, wxWindow*, int, int)':
ui.h:19:51: error: no matching function for call to 'std::basic_string<char>::basic_string(const wxString&)'
/usr/local/lib/gcc45/include/c++/bits/basic_string.tcc:219:5: note: candidates are: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>, std::basic_string<_CharT, _Traits, _Alloc>::size_type = unsigned int]
/usr/local/lib/gcc45/include/c++/bits/basic_string.tcc:212:5: note: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]
...

Looks like your wxWidgets and STL - you should compile your own wxWidgets from the 2.9 release.
Use something like this to configure it and adjust the reference paths in your makefile.unix

Quote

mkdir buildgtk
cd buildgtk
../configure --prefix=/home/my_user/bitcoin/deps \
--with-gtk \
--disable-shared \
--disable-debug_flag \
--enable-stl \
--enable-utf8 \
--with-libjpeg=builtin \
--with-libpng=builtin \
--withregex=builtin \
--with-libtiff=builtin \
--with-zlib=builtin \
--withexpat=builtin