diff --git a/CMakeLists.txt b/CMakeLists.txt
index a9c10a8..ce5e3e7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,6 +47,12 @@ endif ()
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DPFAEDLE_PRECISION=${PFAEDLE_PRECISION}")
 
+find_package(LibZip)
+
+if (LIBZIP_FOUND)
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DLIBZIP_FOUND=1")
+endif()
+
 # http://brianmilco.blogspot.de/2012/11/cmake-automatically-use-git-tags-as.html
 include(GetGitRevisionDescription)
 git_get_tag(VERSION_GIT)
diff --git a/README.md b/README.md
index e4cd8bc..aa1c082 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@
 # pfaedle
 
 Precise OpenStreetMap (OSM) map-matching for public transit schedules ([GTFS](https://developers.google.com/transit/gtfs/reference/) data).
-First described in [this 2018 SIGSPATIAL paper](http://ad-publications.informatik.uni-freiburg.de/SIGSPATIAL_Sparse%20map%20matching%202018.pdf). 
+First described in [this 2018 SIGSPATIAL paper](http://ad-publications.informatik.uni-freiburg.de/SIGSPATIAL_Sparse%20map%20matching%202018.pdf).
 
 For a quick visual inspection of the shape quality, see for example the schedule data for Germany or Switzerland in our tool [TRAVIC](https://travic.app/?z=7&x=1261608.6&y=6430601.6).
 
@@ -17,6 +17,7 @@ For a quick visual inspection of the shape quality, see for example the schedule
 
  * `cmake`
  * `gcc >= 5.0` (or `clang >= 3.9`)
+ * `libzip` (optional, for ZIP support)
 
 ## Building and Installation
 
diff --git a/cmake/FindLibZip.cmake b/cmake/FindLibZip.cmake
index 1b3efc5..cba9415 100644
--- a/cmake/FindLibZip.cmake
+++ b/cmake/FindLibZip.cmake
@@ -44,6 +44,6 @@ MARK_AS_ADVANCED(LIBZIP_LIBRARY LIBZIP_INCLUDE_DIR LIBZIP_CONF_INCLUDE_DIR LIBZI
 
 IF (LIBZIP_FOUND)
   MESSAGE(STATUS "Found libzip: ${LIBZIP_LIBRARY}")
-ELSE (LIPZIP_FOUND)
+ELSE (LIBZIP_FOUND)
   MESSAGE(FATAL_ERROR "Could not find libzip")
 ENDIF (LIBZIP_FOUND)
diff --git a/src/cppgtfs b/src/cppgtfs
index 35ab19c..354fc1d 160000
--- a/src/cppgtfs
+++ b/src/cppgtfs
@@ -1 +1 @@
-Subproject commit 35ab19c313f96fec649fd0cb31c42d281f2c3b6e
+Subproject commit 354fc1d68dd8a1cff43ae2cec9a4d294eabcb0c9
diff --git a/src/pfaedle/gtfs/Writer.cpp b/src/pfaedle/gtfs/Writer.cpp
index d07a566..0380fc1 100644
--- a/src/pfaedle/gtfs/Writer.cpp
+++ b/src/pfaedle/gtfs/Writer.cpp
@@ -3,7 +3,10 @@
 // Authors: Patrick Brosi <brosi@informatik.uni-freiburg.de>
 
 #include <stdio.h>
+
+#ifdef LIBZIP_FOUND
 #include <zip.h>
+#endif
 
 #include <cstdio>
 #include <fstream>
@@ -20,7 +23,9 @@
 
 using ad::cppgtfs::Parser;
 using ad::util::CsvWriter;
+#ifdef LIBZIP_FOUND
 using ad::util::ZipCsvParser;
+#endif
 using pfaedle::gtfs::Writer;
 using util::getTmpFName;
 
@@ -39,6 +44,7 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
 
   if (gtfsPath.size() == 0) gtfsPath = ".";
 
+#ifdef LIBZIP_FOUND
   zip* za = 0;
 
   if (toZip) {
@@ -65,6 +71,11 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
          << ") Could not open ZIP file, reason was: " << errBuf;
       throw ad::cppgtfs::WriterException(ss.str(), tmpZip);
     }
+#else
+  if (toZip) {
+    throw ad::cppgtfs::WriterException(
+        "Could not output ZIP file, pfaedle was compiled without libzip", path);
+#endif
   } else {
     mkdir(path.c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
   }
@@ -80,7 +91,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
     fs.close();
 
     if (toZip) {
+#ifdef LIBZIP_FOUND
       moveIntoZip(za, curFile, "agency.txt");
+#endif
     } else {
       if (std::rename(curFile.c_str(), curFileTg.c_str()))
         cannotWrite(curFileTg);
@@ -94,7 +107,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
     fs.close();
 
     if (toZip) {
+#ifdef LIBZIP_FOUND
       moveIntoZip(za, curFile, "stops.txt");
+#endif
     } else {
       if (std::rename(curFile.c_str(), curFileTg.c_str()))
         cannotWrite(curFileTg);
@@ -108,7 +123,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
     fs.close();
 
     if (toZip) {
+#ifdef LIBZIP_FOUND
       moveIntoZip(za, curFile, "routes.txt");
+#endif
     } else {
       if (std::rename(curFile.c_str(), curFileTg.c_str()))
         cannotWrite(curFileTg);
@@ -123,7 +140,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
       writeCalendar(sourceFeed, &fs);
       fs.close();
       if (toZip) {
+#ifdef LIBZIP_FOUND
         moveIntoZip(za, curFile, "calendar.txt");
+#endif
       } else {
         if (std::rename(curFile.c_str(), curFileTg.c_str()))
           cannotWrite(curFileTg);
@@ -139,7 +158,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
       writeCalendarDates(sourceFeed, &fs);
       fs.close();
       if (toZip) {
+#ifdef LIBZIP_FOUND
         moveIntoZip(za, curFile, "calendar_dates.txt");
+#endif
       } else {
         if (std::rename(curFile.c_str(), curFileTg.c_str()))
           cannotWrite(curFileTg);
@@ -155,7 +176,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
       writeTransfers(sourceFeed, &fs);
       fs.close();
       if (toZip) {
+#ifdef LIBZIP_FOUND
         moveIntoZip(za, curFile, "transfers.txt");
+#endif
       } else {
         if (std::rename(curFile.c_str(), curFileTg.c_str()))
           cannotWrite(curFileTg);
@@ -171,7 +194,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
       writeFares(sourceFeed, &fs);
       fs.close();
       if (toZip) {
+#ifdef LIBZIP_FOUND
         moveIntoZip(za, curFile, "fare_attributes.txt");
+#endif
       } else {
         if (std::rename(curFile.c_str(), curFileTg.c_str()))
           cannotWrite(curFileTg);
@@ -187,7 +212,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
       writeFareRules(sourceFeed, &fs);
       fs.close();
       if (toZip) {
+#ifdef LIBZIP_FOUND
         moveIntoZip(za, curFile, "fare_rules.txt");
+#endif
       } else {
         if (std::rename(curFile.c_str(), curFileTg.c_str()))
           cannotWrite(curFileTg);
@@ -204,7 +231,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
       fs.close();
 
       if (toZip) {
+#ifdef LIBZIP_FOUND
         moveIntoZip(za, curFile, "pathways.txt");
+#endif
       } else {
         if (std::rename(curFile.c_str(), curFileTg.c_str()))
           cannotWrite(curFileTg);
@@ -221,7 +250,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
       fs.close();
 
       if (toZip) {
+#ifdef LIBZIP_FOUND
         moveIntoZip(za, curFile, "levels.txt");
+#endif
       } else {
         if (std::rename(curFile.c_str(), curFileTg.c_str()))
           cannotWrite(curFileTg);
@@ -236,7 +267,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
     fs.close();
 
     if (toZip) {
+#ifdef LIBZIP_FOUND
       moveIntoZip(za, curFile, "shapes.txt");
+#endif
     } else {
       if (std::rename(curFile.c_str(), curFileTg.c_str()))
         cannotWrite(curFileTg);
@@ -250,7 +283,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
     fs.close();
 
     if (toZip) {
+#ifdef LIBZIP_FOUND
       moveIntoZip(za, curFile, "trips.txt");
+#endif
     } else {
       if (std::rename(curFile.c_str(), curFileTg.c_str()))
         cannotWrite(curFileTg);
@@ -266,7 +301,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
       fs.close();
 
       if (toZip) {
+#ifdef LIBZIP_FOUND
         moveIntoZip(za, curFile, "frequencies.txt");
+#endif
       } else {
         if (std::rename(curFile.c_str(), curFileTg.c_str()))
           cannotWrite(curFileTg);
@@ -282,7 +319,9 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
     fs.close();
 
     if (toZip) {
+#ifdef LIBZIP_FOUND
       moveIntoZip(za, curFile, "stop_times.txt");
+#endif
     } else {
       if (std::rename(curFile.c_str(), curFileTg.c_str()))
         cannotWrite(curFileTg);
@@ -298,23 +337,29 @@ void Writer::write(gtfs::Feed* sourceFeed, const std::string& path) const {
       fs.close();
 
       if (toZip) {
+#ifdef LIBZIP_FOUND
         moveIntoZip(za, curFile, "feed_info.txt");
+#endif
       } else {
         if (std::rename(curFile.c_str(), curFileTg.c_str()))
           cannotWrite(curFileTg);
       }
     }
   } catch (...) {
+#ifdef LIBZIP_FOUND
     zip_discard(za);
+#endif
     throw;
   }
 
   if (toZip) {
+#ifdef LIBZIP_FOUND
     std::string targetZipPath = gtfsPath + "/" + zipFileName;
     if (!za) cannotWrite(targetZipPath);
     zip_close(za);
     if (std::rename(tmpZip.c_str(), targetZipPath.c_str()))
       cannotWrite(targetZipPath);
+#endif
   }
 }
 
@@ -334,6 +379,9 @@ void Writer::writeFeedInfo(gtfs::Feed* f, std::ostream* os) const {
   else
     csvw->skip();
   csvw->writeString(f->getVersion());
+  csvw->writeString(f->getContactEmail());
+  csvw->writeString(f->getContactUrl());
+  csvw->writeString(f->getDefaultLang());
   csvw->flushLine();
 }
 
@@ -619,6 +667,7 @@ void Writer::cannotWrite(const std::string& file, const std::string& file2) {
 }
 
 // ___________________________________________________________________________
+#ifdef LIBZIP_FOUND
 void Writer::moveIntoZip(zip* za, const std::string& sourcePath,
                          const std::string& targetPath) {
   zip_source_t* s;
@@ -638,3 +687,4 @@ void Writer::moveIntoZip(zip* za, const std::string& sourcePath,
     cannotWrite(targetPath);
   }
 }
+#endif
diff --git a/src/pfaedle/gtfs/Writer.h b/src/pfaedle/gtfs/Writer.h
index 41e169d..6e32de7 100644
--- a/src/pfaedle/gtfs/Writer.h
+++ b/src/pfaedle/gtfs/Writer.h
@@ -7,6 +7,9 @@
 
 #include <memory>
 #include <string>
+#ifdef LIBZIP_FOUND
+#include <zip.h>
+#endif
 
 #include "Feed.h"
 #include "ad/cppgtfs/Parser.h"
@@ -41,8 +44,10 @@ class Writer {
   static void cannotWrite(const std::string& file, const std::string& file2);
   static void cannotWrite(const std::string& file);
 
+#ifdef LIBZIP_FOUND
   static void moveIntoZip(zip* za, const std::string& sourcePath,
                           const std::string& targetPath);
+#endif
 
   mutable std::ifstream _ifs;
 };