--- a/CMakeLists.orig.txt	2017-03-15 13:01:27.623725000 +0100
+++ b/CMakeLists.txt	2017-03-15 14:12:22.247705049 +0100
@@ -764,6 +764,8 @@
 valid. It should contain the file zlib.h, but it does not.")
     endif()
 
+    find_package(PkgConfig)
+    pkg_check_modules(MINIZIP REQUIRED minizip)
 endif(WITH_ZLIB)
 
 
--- a/src/CMakeLists.orig.txt	2017-03-15 13:01:26.507732000 +0100
+++ b/src/CMakeLists.txt	2017-03-15 14:15:49.173159496 +0100
@@ -353,14 +353,6 @@
 if(WITH_ZLIB)
 
 set(COMPRESS_SOURCES ${COMPRESS_SOURCES}
-        sbml/compress/zip.c
-        sbml/compress/zip.h
-        sbml/compress/unzip.h
-        sbml/compress/unzip.c
-        sbml/compress/ioapi.h
-        sbml/compress/ioapi.c
-        sbml/compress/ioapi_mem.h
-        sbml/compress/ioapi_mem.c
         sbml/compress/zfstream.h
         sbml/compress/zfstream.cpp
         sbml/compress/zipfstream.cpp
@@ -380,7 +372,7 @@
     endif()
 
     include_directories(${LIBZ_INCLUDE_DIR})
-    set(LIBSBML_LIBS ${LIBSBML_LIBS} ${LIBZ_LIBRARY})
+    set(LIBSBML_LIBS ${LIBSBML_LIBS} ${LIBZ_LIBRARY} ${MINIZIP_LIBRARIES})
 
 endif()
 
--- a/src/sbml/compress/zipfstream.orig.h	2017-03-15 13:01:25.633738000 +0100
+++ b/src/sbml/compress/zipfstream.h	2017-03-15 14:18:08.254792811 +0100
@@ -66,8 +66,8 @@
 
 #include <istream>  // not iostream, since we don't need cin/cout
 #include <ostream>
-#include "zip.h"
-#include "unzip.h"
+#include "minizip/zip.h"
+#include "minizip/unzip.h"
 
 /*****************************************************************************/
 
--- a/src/sbml/compress/zipfstream.h.orig	2021-01-07 14:08:02.122268503 +0100
+++ b/src/sbml/compress/zipfstream.h	2021-01-07 14:08:02.142268743 +0100
@@ -44,10 +44,10 @@
  *
  *  zipFile  zipopen (const char* path, const char* filenameinzip, int append);
  *  int      zipclose(zipFile file);
- *  int      zipwrite(zipFile file, voidp buf, unsigned len);
+ *  int      zipwrite(zipFile file, void* buf, unsigned len);
  *  unzFile  unzipopen (const char* path);
  *  int      unzipclose(unzFile file);
- *  int      unzipread (unzFile file, voidp buf, unsigned len);
+ *  int      unzipread (unzFile file, void* buf, unsigned len);
  *
  * Minizip is distributed under the following terms:
  * ---------------------------------------------------------------------------
@@ -504,11 +504,11 @@
 
 zipFile  zipopen (const char* path, const char* filenameinzip, int append);
 int      zipclose(zipFile file);
-int      zipwrite(zipFile file, voidp buf, unsigned len);
+int      zipwrite(zipFile file, void* buf, unsigned len);
 
 unzFile  unzipopen (const char* path);
 int      unzipclose(unzFile file);
-int      unzipread (unzFile file, voidp buf, unsigned len);
+int      unzipread (unzFile file, void* buf, unsigned len);
 
 
 
--- a/src/sbml/compress/zipfstream.cpp.orig	2020-11-25 11:58:43.000000000 +0100
+++ b/src/sbml/compress/zipfstream.cpp	2021-01-07 14:08:02.143268755 +0100
@@ -44,10 +44,10 @@
  *
  *  zipFile  zipopen (const char* path, const char* filenameinzip, int append);
  *  int      zipclose(zipFile file);
- *  int      zipwrite(zipFile file, voidp buf, unsigned len);
+ *  int      zipwrite(zipFile file, void* buf, unsigned len);
  *  unzFile  unzipopen (const char* path);
  *  int      unzipclose(unzFile file);
- *  int      unzipread (unzFile file, voidp buf, unsigned len);
+ *  int      unzipread (unzFile file, void* buf, unsigned len);
  *
  * Minizip is distributed under the following terms:
  * ---------------------------------------------------------------------------
@@ -94,7 +94,7 @@
 #define BIGBUFSIZE BUFSIZ
 #define SMALLBUFSIZE 1
 
-uLong filetime(const char* f, tm_zip* tmzip, uLong* dt);
+unsigned long filetime(const char* f, tm_zip* tmzip, uint32_t* dt);
 
 /*****************************************************************************/
 
@@ -547,7 +547,7 @@
     err = zipOpenNewFileInZip(zf,filenameinzip,&zi,
                      NULL,0,NULL,0,NULL,
                      Z_DEFLATED,
-                     Z_DEFAULT_COMPRESSION);
+                     Z_DEFLATED);
   
     if (err != ZIP_OK)
     {
@@ -563,7 +563,7 @@
   return zipClose(file,NULL);
 }
 
-int zipwrite(zipFile file, voidp buf, unsigned len)
+int zipwrite(zipFile file, void* buf, unsigned len)
 {
   return zipWriteInFileInZip (file,buf,len);
 }
@@ -615,14 +615,14 @@
   return unzClose(file);
 }
 
-int  unzipread (unzFile file, voidp buf, unsigned len)
+int  unzipread (unzFile file, void* buf, unsigned len)
 {
   return unzReadCurrentFile(file,buf,len);
 }
 
 
 #if defined(WIN32) && !defined(CYGWIN)
-uLong filetime(const char* f, tm_zip* tmzip, uLong *dt)
+unsigned long filetime(const char* f, tm_zip* tmzip, uint32_t* dt)
 {
   int ret = 0;
   {
@@ -643,7 +643,7 @@
 }
 #else
 #if defined(unix) || defined(MACOSX)
-uLong filetime(const char* f, tm_zip* tmzip, uLong *dt)
+unsigned long filetime(const char* f, tm_zip* tmzip, uint32_t* dt)
 {
   int ret=0;
   struct stat s;        /* results of stat() */
@@ -682,7 +682,7 @@
   return ret;
 }
 #else
-uLong filetime(const char* f, tm_zip* tmzip, uLong *dt)
+unsigned long filetime(const char* f, tm_zip* tmzip, uint32_t* dt)
 {
     return 0;
 }