Hi, 
I'm trying plruby compile.

My platfrorm.
Debian GNU Linux
Linux 2.2.18pre21 i586

PostgreSQL-7.1
Ruby-1.6.4preview2

plruby-0.2.2

$ ruby extconf.rb --with-pgsql-include-dir=/usr/local/pgsql/include \
                  --with-pgsql-lib-dir=/usr/local/pgsql/lib \
		  --with-pgsql-srcinc-dir=/usr/local/src/postgresql-7.1/src/include/ \
                  --with-pgsql-version=71 

$ make
gcc -fPIC -g -O2 -I/usr/local/src/postgresql-7.1/src/include/ -I/usr/local/pgsql/include -DPG_PL_VERSION=71 -I/usr/local/lib/ruby/1.6/i586-linux -I/usr/local/include -DHAVE_CATALOG_PG_PROC_H   -c -o plruby.o plruby.c
gcc -shared  -L/usr/local/lib/ruby/1.6/i586-linux -L/usr/local/lib  -L/usr/local/pgsql/lib -o plruby.so plruby.o  -lruby -lpq -lc 

$ make test
(cd test/plt ; ./runtest 71)
**** Destroy old database plruby_test ****
DROP DATABASE
**** Create test database plruby_test ****
CREATE DATABASE
**** Create procedural language plruby ****
**** Create tables, functions and triggers ****
**** Running test queries ****
    Tests faild - look at diffs between
    test.expected.71 and test.out
(cd test/plp ; ./runtest 71)
**** Destroy old database plruby_test ****
psql: The Data Base System is starting up
dropdb: database removal failed
**** Create test database plruby_test ****
psql: The Data Base System is starting up
createdb: database creation failed
**** Create procedural language plruby ****
psql: The Data Base System is starting up
**** Create tables, functions and triggers ****
psql: The Data Base System is starting up
**** Running test queries ****
    Tests faild - look at diffs between
    test.expected.71 and test.out

$ ls -l plruby.o plruby.so
-rw-r--r--    1 noboru   noboru     136640  May  4 21:23 plruby.o
-rwxr-xr-x    1 noboru   noboru    1653858  May  4 21:23 plruby.so
                                   ~~~~~~~
I alterd Makefile.
$ diff Makefile~ Makefile
15c15
< DLDFLAGS =  -L/usr/local/lib/ruby/1.6/i586-linux -L/usr/local/lib  -L/usr/local/pgsql/lib
---
> DLDFLAGS =  -L/usr/local/lib  -L/usr/local/pgsql/lib

$ make
gcc -fPIC -g -O2 -I/usr/local/src/postgresql-7.1/src/include/ -I/usr/local/pgsql/include -DPG_PL_VERSION=71 -I/usr/local/lib/ruby/1.6/i586-linux -I/usr/local/include -DHAVE_CATALOG_PG_PROC_H   -c -o plruby.o plruby.c
gcc -shared  -L/usr/local/lib  -L/usr/local/pgsql/lib -o plruby.so plruby.o  -lruby -lpq -lc 

$ ls -l plruby.o plruby.so
-rw-r--r--    1 noboru   noboru     136640  May  4 22:04 plruby.o
-rwxr-xr-x    1 noboru   noboru     137929  May  4 22:04 plruby.so

$ make test
(cd test/plt ; ./runtest 71)
**** Destroy old database plruby_test ****
DROP DATABASE
**** Create test database plruby_test ****
CREATE DATABASE
**** Create procedural language plruby ****
**** Create tables, functions and triggers ****
**** Running test queries ****
    Tests passed O.K.
(cd test/plp ; ./runtest 71)
**** Destroy old database plruby_test ****
DROP DATABASE
**** Create test database plruby_test ****
CREATE DATABASE
**** Create procedural language plruby ****
**** Create tables, functions and triggers ****
**** Running test queries ****
    Tests passed O.K.

Have a good idea of how to fix it?