Installing sqlite3-ruby on Mac OS X 10.5:

stefan@macbook-pro-2:~$ sudo gem install sqlite3-ruby
Building native extensions.  This could take a while...
ERROR:  Error installing sqlite3-ruby:
	ERROR: Failed to build gem native extension.

/opt/local/bin/ruby extconf.rb install sqlite3-ruby
checking for fdatasync() in -lrt... no
checking for sqlite3.h... yes
checking for sqlite3_open() in -lsqlite3... yes
creating Makefile

make
gcc -I. -I. -I/opt/local/lib/ruby/1.8/i686-darwin9.2.0 -I. -DHAVE_SQLITE3_H -I/usr/local/include  -fno-common -D_XOPEN_SOURCE=1  -fno-common -pipe -fno-common  -c sqlite3_api_wrap.c
cc -dynamic -bundle -undefined suppress -flat_namespace -o sqlite3_api.bundle sqlite3_api_wrap.o -L"." -L"/opt/local/lib" -L"/usr/local/lib" -L.     -lruby -lsqlite3  -lpthread -ldl -lobjc
ld: in /usr/local/lib/libstdc++.6.dylib, file is not of required architecture
collect2: ld returned 1 exit status
make: *** [sqlite3_api.bundle] Error 1


Gem files will remain installed in /opt/local/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.4 for inspection.
Results logged to /opt/local/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.4/ext/sqlite3_api/gem_make.out


Solution:
Change the LIBPATH in /opt/local/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.4/ext/sqlite3_api/Makefile

from: "/usr/local/lib" -> "/usr/lib"

then run:
  sudo make && sudo make install



Makefile Diff:
--- Makefile	2008-10-06 20:36:37.000000000 +1300
+++ /Users/stefan/Makefile	2008-10-06 20:36:30.000000000 +1300
@@ -69,7 +69,7 @@
 preload =

 libpath = . $(libdir) /usr/local/lib
-LIBPATH =  -L"." -L"$(libdir)" -L"/usr/local/lib"
+LIBPATH =  -L"." -L"$(libdir)" -L"/usr/lib"
 DEFFILE =

 CLEANFILES = mkmf.log