Fix: Building and running on macOS

1. CMakeLists.txt was modified to use .so on macOS instead of the default .dylib
2. build.sh was modified to use readlink from GNU coreutils on macOS when creating the id2t-script

build.sh

@@ -31,6 +31,9 @@ cd ../../../
 cat >./id2t  <<EOF
 #!/bin/sh
 # Find the executable
+if [ $(uname) == 'Darwin' ]; then
+    alias readlink='greadlink'
+fi
 ID2T_DIR=\$(readlink -f \$0)
 SCRIPT_PATH=\${ID2T_DIR%/*}
 cd \$SCRIPT_PATH

code_boost/src/CMakeLists.txt

@@ -77,6 +77,10 @@ ADD_LIBRARY(pcapreader SHARED ${SOURCE_FILES})
 # Libs pthread and dl are prerequisites of SQLiteCpp
 TARGET_LINK_LIBRARIES(pcapreader ${Boost_LIBRARIES} "${TINS_LIBRARY}" ${PYTHON_LIBRARIES} SQLiteCpp sqlite3 pthread dl)
 
+IF (APPLE)
+  SET(CMAKE_SHARED_LIBRARY_SUFFIX ".so")
+ENDIF ()
+
 # comment this out to build executable (for development)
 #ADD_EXECUTABLE(cpp-pcapreader ${SOURCE_FILES})
 #TARGET_LINK_LIBRARIES(cpp-pcapreader ${Boost_LIBRARIES} "${TINS_LIBRARY}" SQLiteCpp sqlite3 pthread dl)