<p>After <a href="https://github.com/mlpack/mlpack/pull/645" class="issue-link js-issue-link" data-url="https://github.com/mlpack/mlpack/issues/645" data-id="156525880" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#645</a> the test file for range_search is failing to build. can you tell me how to fix ?</p>

<pre><code>Generating man page for mlpack_nmf...
Generating man page for mlpack_logistic_regression...
Generating man page for mlpack_local_coordinate_coding...
Generating man page for mlpack_nca...
[ 51%] Built target man
Linking CXX executable ../../../bin/mlpack_test
CMakeFiles/mlpack_test.dir/range_search_test.cpp.o: In function `RangeSearchTest::RSModelTest::test_method()':
/home/ayan/Desktop/mlpack/src/mlpack/tests/range_search_test.cpp:1254: undefined reference to `mlpack::range::RSModel::RSModel(int, bool)'
/home/ayan/Desktop/mlpack/src/mlpack/tests/range_search_test.cpp:1255: undefined reference to `mlpack::range::RSModel::RSModel(int, bool)'
/home/ayan/Desktop/mlpack/src/mlpack/tests/range_search_test.cpp:1256: undefined reference to `mlpack::range::RSModel::RSModel(int, bool)'
/home/ayan/Desktop/mlpack/src/mlpack/tests/range_search_test.cpp:1257: undefined reference to `mlpack::range::RSModel::RSModel(int, bool)'
/home/ayan/Desktop/mlpack/src/mlpack/tests/range_search_test.cpp:1258: undefined reference to `mlpack::range::RSModel::RSModel(int, bool)'
CMakeFiles/mlpack_test.dir/range_search_test.cpp.o:/home/ayan/Desktop/mlpack/src/mlpack/tests/range_search_test.cpp:1259: more undefined references to `mlpack::range::RSModel::RSModel(int, bool)' follow
collect2: error: ld returned 1 exit status
make[2]: *** [bin/mlpack_test] Error 1
make[1]: *** [src/mlpack/tests/CMakeFiles/mlpack_test.dir/all] Error 2
make: *** [all] Error 2
</code></pre>

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