Datamapper DataMapper

1. Stock 10.6 install, running on X86_64.
   
2. sudo gem install do_sqlite3
   
3. Results:
   

   Building native extensions.  This could take a while...
   ERROR:  Error installing do_sqlite3:
   ERROR: Failed to build gem native extension.
   /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
   checking for sqlite3.h... yes
   checking for sqlite3_open() in -lsqlite3... no
   make
   gcc -I. -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin10.0 -I. -DHAVE_SQLITE3_H -DHAVE_SQLITE3_PREPARE_V2 -DHAVE_SQLITE3_OPEN_V2 -I/usr/local/include -I/opt/local/include -I/usr/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common  -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common  -Wall   -c do_sqlite3.c
   do_sqlite3.c: In function ‘flags_from_uri’:
   do_sqlite3.c:411: error: ‘SQLITE_OPEN_CREATE’ undeclared (first use in this function)
   do_sqlite3.c:411: error: (Each undeclared identifier is reported only once
   do_sqlite3.c:411: error: for each function it appears in.)
   do_sqlite3.c:413: error: ‘SQLITE_OPEN_READWRITE’ undeclared (first use in this function)
   do_sqlite3.c: In function ‘cConnection_initialize’:
   do_sqlite3.c:431: warning: implicit declaration of function ‘sqlite3_open_v2’
   make: *** [do_sqlite3.o] Error 1
   Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/do_sqlite3-0.10.1.1 for inspection.
   Results logged to /Library/Ruby/Gems/1.8/gems/do_sqlite3-0.10.1.1/ext/do_sqlite3/gem_make.out
   

I've tried this with sqlite3-ruby both installed and uninstalled, in case there were conflicts.