IPS-67 Don't rebuild if not needed

build-pEpEngine-macOS.sh

@@ -32,7 +32,7 @@ PARENT_DIR="${SCRIPT_DIR}/.."
 
 if [ -f "${PREFIX}/lib/libpEpEngine.a" ]; then
     echo "lib exists already in ${PREFIX}/lib. If you want to rebuild it, delete the existing one."
-    #exit 0
+    exit 0
 fi
 
 # libpEpTransport