i executed make test and it seems that some of the tests are also 
failing:
jarmo@jarmo-laptop:~/Downloads/ruby-1.8.6-p399$ make test
not ok float 1 -- ./sample/test.rb:1172
not ok float 2 -- ./sample/test.rb:1173
not ok float 3 -- ./sample/test.rb:1174
not ok float 4 -- ./sample/test.rb:1175
not ok float 5 -- ./sample/test.rb:1176
not ok float 6 -- ./sample/test.rb:1177
not ok float 7 -- ./sample/test.rb:1178
not ok float 8 -- ./sample/test.rb:1179
not ok float 9 -- ./sample/test.rb:1180
test failed
make: *** [test] Error 1


# test.rb
1172 test_ok(2.6.floor == 2)
1173 test_ok((-2.6).floor == -3)
1174 test_ok(2.6.ceil == 3)
1175 test_ok((-2.6).ceil == -2)
1176 test_ok(2.6.truncate == 2)
1177 test_ok((-2.6).truncate == -2)
1178 test_ok(2.6.round == 3)
1179 test_ok((-2.4).truncate == -2)
1180 test_ok((13.4 % 1 - 0.4).abs < 0.0001)

Is there any special switches or commands i should use while compiling?

Jarmo
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