I dont get in a UNO the orange color of the library name that tells me its working. I have checked my libraries, and everything looks ok, the library is there.
I wrote it just the same as the informatrion i founded outthere:
#define rxPin 4 // connect to the LRF's SOUT pin
#define txPin 3 // connect to the LRF's SIN pin thru a 4.7k resister
SoftwareSerial lrfSerial = SoftwareSerial(rxPin, txPin);
I downloaded the "NewSoftSerial" library, and with this one, the library is recognized, but what I got from the developers website is that for arduino 1.0 up is not necessary to install.http://arduiniana.org/libraries/newsoftserial/
"NewSoftSerial is in the core! Starting with Arduino 1.0 (December, 2011), NewSoftSerial has replaced the old SoftwareSerial library as the officially supported software serial library. This means that if you have 1.0 or later, you should not download this library. To port your code to 1.0, simply change all NewSoftSerial references to SoftwareSerial."
Dont really get the point of it...
PD: thanks for the UNO tipp, thats useful.