I have installed lucene, but could not import it in class

I have installed lucene, as it written in BUILD.txt. Building output:

 Buildfile: /home/ali/Downloads/lucene-3.6.1/build.xml

check-lucene-core-uptodate:

compile-lucene-core:

jflex-uptodate-check:

jflex-notice:
     [echo] 
     [echo]       One or more of the JFlex .jflex files is newer than its corresponding
     [echo]       .java file.  Run the "jflex" target to regenerate the artifacts.
     [echo]     

javacc-uptodate-check:

javacc-notice:

ivy-availability-check:

ivy-fail:

resolve:
[ivy:retrieve] :: Ivy 2.2.0 - 20100923230623 :: http://ant.apache.org/ivy/ ::
[ivy:retrieve] :: loading settings :: url = jar:file:/home/ali/.ant/lib/ivy-2.2.0.jar!/org/apache/ivy/core/settings/ivysettings.xml

init:

clover.setup:

clover.info:
     [echo] 
     [echo]       Clover not found. Code coverage reports disabled.
     [echo]     

clover:

common.compile-core:
    [mkdir] Created dir: /home/ali/Downloads/lucene-3.6.1/build/core/classes/java
    [javac] Compiling 503 source files to /home/ali/Downloads/lucene-3.6.1/build/core/classes/java
    [javac] /home/ali/Downloads/lucene-3.6.1/core/src/java/org/apache/lucene/queryParser/CharStream.java:50: warning: [dep-ann] deprecated item is not annotated with @Deprecated
    [javac]   int getEndColumn();
    [javac]       ^
    [javac] /home/ali/Downloads/lucene-3.6.1/core/src/java/org/apache/lucene/queryParser/QueryParserTokenManager.java:441: warning: [cast] redundant cast to int
    [javac]          int hiByte = (int)(curChar >> 8);
    [javac]                       ^
    [javac] /home/ali/Downloads/lucene-3.6.1/core/src/java/org/apache/lucene/queryParser/QueryParserTokenManager.java:691: warning: [cast] redundant cast to int
    [javac]          int hiByte = (int)(curChar >> 8);
    [javac]                       ^
    [javac] /home/ali/Downloads/lucene-3.6.1/core/src/java/org/apache/lucene/queryParser/QueryParserTokenManager.java:798: warning: [cast] redundant cast to int
    [javac]          int hiByte = (int)(curChar >> 8);
    [javac]                       ^
    [javac] /home/ali/Downloads/lucene-3.6.1/core/src/java/org/apache/lucene/queryParser/QueryParserTokenManager.java:969: warning: [cast] redundant cast to int
    [javac]          int hiByte = (int)(curChar >> 8);
    [javac]                       ^
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] 5 warnings

compile-core:

jar-core:

jflex-uptodate-check:

jflex-notice:
     [echo] 
     [echo]       One or more of the JFlex .jflex files is newer than its corresponding
     [echo]       .java file.  Run the "jflex" target to regenerate the artifacts.
     [echo]     

javacc-uptodate-check:

javacc-notice:

ivy-availability-check:

ivy-fail:

resolve:
[ivy:retrieve] :: loading settings :: url = jar:file:/home/ali/.ant/lib/ivy-2.2.0.jar!/org/apache/ivy/core/settings/ivysettings.xml

init:

clover.setup:

clover.info:
     [echo] 
     [echo]       Clover not found. Code coverage reports disabled.
     [echo]     

clover:

common.compile-core:

compile-core:

jar-core:
      [jar] Building jar: /home/ali/Downloads/lucene-3.6.1/build/core/lucene-core-3.6.1-SNAPSHOT.jar

default:

BUILD SUCCESSFUL
Total time: 10 seconds

But when I want to import it to the class in Eclipse, I don't see any lucene option there. For example, I would like to import

import org.apache.lucene.analysis.standard.StandardAnalyzer

Eclipse shows error that there is no such library. What is the problem?