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diff --git a/incbwt/parallel_build.cpp b/incbwt/parallel_build.cpp
new file mode 100644
index 0000000..6c73c44
--- /dev/null
+++ b/incbwt/parallel_build.cpp
@@ -0,0 +1,198 @@
+#include <algorithm>
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+#ifdef MULTITHREAD_SUPPORT
+#include <omp.h>
+#endif
+
+#include "rlcsa_builder.h"
+#include "misc/utils.h"
+
+
+using namespace CSA;
+
+
+double indexParts(std::vector<std::string>& filename, usint threads, Parameters& parameters);
+
+const int MAX_THREADS = 64;
+
+
+int
+main(int argc, char** argv)
+{
+  std::cout << "Parallel RLCSA builder" << std::endl;
+  if(argc < 3)
+  {
+    std::cout << "Usage: parallel_build [-n] listname output [threads]" << std::endl;
+    std::cout << "  -n   do not merge the indexes" << std::endl;
+    return 1;
+  }
+
+  int list_parameter = 1, output_parameter = 2, threads_parameter = 3;
+  bool do_merge = true;
+  if(std::string("-n").compare(argv[1]) == 0)
+  {
+    list_parameter++; output_parameter++; threads_parameter++;
+    do_merge = false;
+    std::cout << "Option '-n' specified. Partial indexes will not be merged." << std::endl;
+  }
+
+  std::ifstream filelist(argv[list_parameter], std::ios_base::binary);
+  if(!filelist)
+  {
+    std::cerr << "Error opening file list!" << std::endl;
+    return 2;
+  }
+  std::vector<std::string> files;
+  readRows(filelist, files, true);
+  filelist.close();
+  std::cout << "Input files: " << files.size() << std::endl;
+
+  std::string base_name = argv[output_parameter];
+  std::cout << "Output: " << base_name << std::endl;
+
+  usint threads = 1;
+  if(argc > threads_parameter)
+  {
+    threads = std::min(MAX_THREADS, std::max(atoi(argv[threads_parameter]), 1));
+  }
+  std::cout << "Threads: " << threads << std::endl; 
+  std::cout << std::endl;
+
+  std::string parameters_name = base_name + PARAMETERS_EXTENSION;
+  Parameters parameters;
+  parameters.set(RLCSA_BLOCK_SIZE);
+  parameters.set(SAMPLE_RATE);
+  parameters.set(SUPPORT_LOCATE);
+  parameters.set(SUPPORT_DISPLAY);
+  parameters.read(parameters_name);
+  parameters.print();
+
+  double start = readTimer();
+  double megabytes = indexParts(files, threads, parameters);
+
+  RLCSABuilder builder(parameters.get(RLCSA_BLOCK_SIZE), parameters.get(SAMPLE_RATE), 0, threads);
+  if(do_merge)
+  {
+    std::cout << "Phase 2: Merging the indexes" << std::endl;
+    for(std::vector<std::string>::iterator iter = files.begin(); iter != files.end(); iter++)
+    {
+      std::cout << "Increment: " << *iter << std::endl;
+      builder.insertFromFile(*iter);
+    }
+    std::cout << std::endl;
+  
+    RLCSA* index = builder.getRLCSA();
+    if(index != 0 && index->isOk())
+    {
+      index->printInfo();
+      index->reportSize(true);
+      index->writeTo(base_name);
+      parameters.write(parameters_name);
+    }
+    delete index;
+  }
+
+  double stop = readTimer();
+  std::cout << megabytes << " megabytes indexed in " << (stop - start) << " seconds (" << (megabytes / (stop - start)) << " MB/s)." << std::endl;
+  if(do_merge)
+  {
+    std::cout << "Search time:  " << builder.getSearchTime() << " seconds" << std::endl;
+    std::cout << "Sort time:    " << builder.getSortTime() << " seconds" << std::endl;
+    std::cout << "Merge time:   " << builder.getMergeTime() << " seconds" << std::endl;
+  }
+  std::cout << std::endl;
+
+  return 0;
+}
+
+
+double
+indexParts(std::vector<std::string>& filenames, usint threads, Parameters& parameters)
+{
+  double start = readTimer();
+  std::cout << "Phase 1: Building indexes for input files" << std::endl;
+  usint block_size = parameters.get(RLCSA_BLOCK_SIZE);
+  usint sample_rate = parameters.get(SAMPLE_RATE);
+  usint total_size = 0;
+
+  std::ifstream* input_file;
+  usint size;
+  std::string parameters_name;
+  RLCSA* index;
+  uchar* data;
+  sint i;
+
+  #ifdef MULTITHREAD_SUPPORT
+  omp_set_num_threads(threads);
+  #pragma omp parallel private(input_file, size, parameters_name, index, data)
+  {
+    #pragma omp for schedule(dynamic, 1)
+  #endif
+    for(i = 0; i < (sint)(filenames.size()); i++)
+    {
+      #ifdef MULTITHREAD_SUPPORT
+      #pragma omp critical
+      {
+      #endif
+        size = 0; data = 0;
+        std::cout << "Input: " << filenames[i] << std::endl;
+        input_file = new std::ifstream(filenames[i].c_str(), std::ios_base::binary);
+        if(input_file == 0)
+        {
+          std::cerr << "Error opening input file " << filenames[i] << "!" << std::endl;
+        }
+        else
+        {
+          size = fileSize(*input_file);
+          data = new uchar[size];
+          input_file->read((char*)data, size);
+          delete input_file;
+        }
+      #ifdef MULTITHREAD_SUPPORT
+      }
+      #endif
+
+      if(size > 0)
+      {
+        index = new RLCSA(data, size, block_size, sample_rate, true, true);
+        if(index != 0 && index->isOk()) { index->writeTo(filenames[i]); }
+        delete index;
+
+        #ifdef MULTITHREAD_SUPPORT
+        #pragma omp critical
+        {
+        #endif
+          total_size += size;
+          parameters_name = filenames[i] + PARAMETERS_EXTENSION;
+          parameters.write(parameters_name);
+        #ifdef MULTITHREAD_SUPPORT
+        }
+        #endif
+      }
+      else
+      {
+        #ifdef MULTITHREAD_SUPPORT
+        #pragma omp critical
+        {
+        #endif
+          std::cerr << "Warning: Empty input file " << filenames[i] << "!" << std::endl;
+        #ifdef MULTITHREAD_SUPPORT
+        }
+        #endif
+      }
+    }
+  #ifdef MULTITHREAD_SUPPORT
+  }
+  #endif
+
+  double stop = readTimer();
+  double megabytes = total_size / (double)MEGABYTE;
+  std::cout << "Indexed " << megabytes << " megabytes in " << (stop - start) << " seconds (" << (megabytes / (stop - start)) << " MB/s)." << std::endl;
+  std::cout << std::endl;
+
+  return megabytes;
+}