diff -x '.*' -Naur a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt	2021-06-24 16:56:37.000000000 +0800
+++ b/CMakeLists.txt	2021-06-24 17:30:28.000000000 +0800
@@ -163,6 +163,13 @@
     include/time_conversion/gnss_error.h
 )
 
+# fix dependency introduced by xerces
+if(APPLE)
+    find_library(CORE_FOUNDATION CoreFoundation REQUIRED)
+    find_library(CORE_SERVICES CoreServices REQUIRED)
+    set(EXTRA_LINK_FLAGS_OSX ${CORE_FOUNDATION} ${CORE_SERVICES})
+endif()
+
 #
 # Example programs
 #
@@ -174,6 +181,7 @@
     E57RefImpl
     ${XML_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LINK_FLAGS_OSX}
 )
 add_executable( DemoRead01
     src/examples/DemoRead01.cpp
@@ -182,6 +190,7 @@
     E57RefImpl
     ${XML_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LINK_FLAGS_OSX}
 )
 
 #
@@ -203,6 +212,7 @@
     ${XML_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
     ${LAS2E57_EXTRA_LINK}
+    ${EXTRA_LINK_FLAGS_OSX}
 )
 add_executable( e57fields
     src/tools/e57fields.cpp
@@ -211,6 +221,7 @@
     E57RefImpl
     ${XML_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LINK_FLAGS_OSX}
 )
 add_executable( e57xmldump
     src/tools/e57xmldump.cpp
@@ -219,6 +230,7 @@
     E57RefImpl
     ${XML_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LINK_FLAGS_OSX}
 )
 add_executable( e57validate
     src/tools/e57validate.cpp
@@ -227,6 +239,7 @@
     E57RefImpl
     ${XML_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LINK_FLAGS_OSX}
 )
 add_executable( e57unpack
     src/tools/e57unpack.cpp
@@ -236,6 +249,7 @@
     ${XML_LIBRARIES}
     ${Boost_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LINK_FLAGS_OSX}
 )
 
 #
diff -x '.*' -Naur a/src/refimpl/E57FoundationImpl.cpp b/src/refimpl/E57FoundationImpl.cpp
--- a/src/refimpl/E57FoundationImpl.cpp	2012-04-12 21:44:42.000000000 +0800
+++ b/src/refimpl/E57FoundationImpl.cpp	2021-06-24 17:04:57.000000000 +0800
@@ -57,6 +57,12 @@
 # include <fcntl.h>
 # define O_BINARY (0)
 # define _unlink unlink
+#elif defined( __APPLE__ )
+# include <sys/types.h>
+# include <unistd.h>
+# include <fcntl.h>
+# define O_BINARY (0)
+# define _unlink unlink
 #else
 #  error "no supported OS platform defined"
 #endif
@@ -4764,6 +4770,8 @@
 #  endif
 #elif defined(LINUX)
     int64_t result = ::lseek64(fd_, offset, whence);
+#elif defined( __APPLE__ )
+    int64_t result = ::lseek(fd_, offset, whence);
 #else
 #  error "no supported OS platform defined"
 #endif
diff -x '.*' -Naur a/src/refimpl/E57Simple.cpp b/src/refimpl/E57Simple.cpp
--- a/src/refimpl/E57Simple.cpp	2011-05-14 05:40:11.000000000 +0800
+++ b/src/refimpl/E57Simple.cpp	2021-06-24 16:58:24.000000000 +0800
@@ -799,6 +799,9 @@
 #  define __LARGE64_FILES
 #  include <sys/types.h>
 #  include <unistd.h>
+#elif defined( __APPLE__ )
+#  include <sys/types.h>
+#  include <unistd.h>
 #else
 #  error "no supported OS platform defined"
 #endif
diff -x '.*' -Naur a/src/refimpl/E57SimpleImpl.cpp b/src/refimpl/E57SimpleImpl.cpp
--- a/src/refimpl/E57SimpleImpl.cpp	2012-04-12 23:15:46.000000000 +0800
+++ b/src/refimpl/E57SimpleImpl.cpp	2021-06-24 16:58:24.000000000 +0800
@@ -74,6 +74,12 @@
 #  include <boost/uuid/uuid.hpp>
 #  include <boost/uuid/uuid_generators.hpp>
 #  include <boost/uuid/uuid_io.hpp>
+#elif defined(__APPLE__)
+#  include <sys/types.h>
+#  include <unistd.h>
+#  include <boost/uuid/uuid.hpp>
+#  include <boost/uuid/uuid_generators.hpp>
+#  include <boost/uuid/uuid_io.hpp>
 #else
 #  error "no supported OS platform defined"
 #endif
diff -x '.*' -Naur a/src/tools/las2e57.cpp b/src/tools/las2e57.cpp
--- a/src/tools/las2e57.cpp	2012-04-04 19:09:11.000000000 +0800
+++ b/src/tools/las2e57.cpp	2021-06-24 17:11:11.000000000 +0800
@@ -404,12 +404,12 @@
     int64_t     startIndex;
     BoundingBox bbox;
 
-                GroupRecord(int64_t id);
+                GroupRecord(int64_t id = 0);
     void        addMember(double coords[3], int64_t recordIndex);
     void        dump(int indent = 0, std::ostream& os = std::cout);
 };
 
-GroupRecord::GroupRecord(int64_t id_arg = 0)
+GroupRecord::GroupRecord(int64_t id_arg)
 : id(id_arg),
   count(0),
   startIndex(0),