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diff --git a/incbwt/build_rlcsa.cpp b/incbwt/build_rlcsa.cpp
new file mode 100644
index 0000000..073dcd5
--- /dev/null
+++ b/incbwt/build_rlcsa.cpp
@@ -0,0 +1,105 @@
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+#include "rlcsa_builder.h"
+#include "misc/utils.h"
+
+
+using namespace CSA;
+
+
+
+int
+lineByLineRLCSA(std::string base_name, usint block_size, usint sample_rate, usint buffer_size)
+{
+  Parameters parameters;
+  parameters.set(RLCSA_BLOCK_SIZE.first, block_size);
+  parameters.set(SAMPLE_RATE.first, sample_rate);
+
+  if(sample_rate > 0)
+  {
+    parameters.set(SUPPORT_LOCATE.first, 1);
+    parameters.set(SUPPORT_DISPLAY.first, 1);
+  }
+  else
+  {
+    parameters.set(SUPPORT_LOCATE.first, 0);
+    parameters.set(SUPPORT_DISPLAY.first, 0);
+  }
+
+  std::string parameters_name = base_name + PARAMETERS_EXTENSION;
+  parameters.print();
+  parameters.write(parameters_name);
+
+  std::cout << "Input: " << base_name << std::endl;
+  std::ifstream input_file(base_name.c_str(), std::ios_base::binary);
+  if(!input_file)
+  {
+    std::cerr << "Error opening input file!" << std::endl;
+    return 2;
+  }
+  std::cout << "Buffer size: " << buffer_size << " MB" << std::endl;
+  std::cout << std::endl;
+
+  double start = readTimer();
+  RLCSABuilder builder(parameters.get(RLCSA_BLOCK_SIZE), parameters.get(SAMPLE_RATE), buffer_size * MEGABYTE);
+
+  usint lines = 0, total = 0;
+  while(input_file)
+  {
+    char buffer[16384];  // FIXME What if lines are longer? Probably fails.
+    input_file.getline(buffer, 16384);
+    usint chars = input_file.gcount();
+    lines++; total += chars;
+    if(chars >= 16383) { std::cout << lines << ": " << chars << " chars read!" << std::endl; }
+    if(chars > 1) { builder.insertSequence(buffer, chars - 1, false); }
+  }
+
+  RLCSA* rlcsa = 0;
+  if(builder.isOk())
+  {
+    rlcsa = builder.getRLCSA();
+    rlcsa->writeTo(base_name);
+  }
+  else
+  {
+    std::cerr << "Error: RLCSA construction failed!" << std::endl;
+    return 3;
+  }
+
+  double time = readTimer() - start;
+  double build_time = builder.getBuildTime();
+  double search_time = builder.getSearchTime();
+  double sort_time = builder.getSortTime();
+  double merge_time = builder.getMergeTime();
+
+  double megabytes = rlcsa->getSize() / (double)MEGABYTE;
+  usint sequences = rlcsa->getNumberOfSequences();
+  std::cout << sequences << " sequences" << std::endl;
+  std::cout << megabytes << " megabytes in " << time << " seconds (" << (megabytes / time) << " MB/s)" << std::endl;
+  std::cout << "(build " << build_time << " s, search " << search_time << "s, sort " << sort_time << " s, merge " << merge_time << " s)" << std::endl;
+  std::cout << std::endl;
+
+  delete rlcsa;
+  return 0;
+}
+
+
+int
+main(int argc, char** argv)
+{
+  std::cout << "Line-by-line RLCSA builder" << std::endl;
+  if(argc < 3)
+  {
+    std::cout << "Usage: build_rlcsa base_name buffer_size [block_size [sample_rate]]" << std::endl;
+    return 1;
+  }
+  std::cout << std::endl;
+
+  int name_arg = 1, buffer_arg = 2, block_arg = 3, sample_arg = 4;
+  usint block_size = (argc > block_arg ? atoi(argv[block_arg]) : RLCSA_BLOCK_SIZE.second);
+  usint sample_rate = (argc > sample_arg ? atoi(argv[sample_arg]) : SAMPLE_RATE.second);
+  return lineByLineRLCSA(argv[name_arg], block_size, sample_rate, atoi(argv[buffer_arg]));
+}