diff --git a/src/USER-OMP/Package.sh b/src/USER-OMP/Package.sh
new file mode 100644
index 0000000000..e5093da4fd
--- /dev/null
+++ b/src/USER-OMP/Package.sh
@@ -0,0 +1,40 @@
+# Update package files in LAMMPS
+# Copy package file to src if it doesn't exists or is different.
+# But only copy the file, if a non-OpenMP version exists and
+# remove OpenMP versions that have no matching serial file
+# installed, e.g. after a package has been removed.
+
+for file in *_omp.cpp *_omp.h ; do
+  # these are special cases and handled below
+  if (test $file = "thr_omp.h") || (test $file = "thr_omp.cpp") then
+    continue
+  fi
+  # derive name of non-OpenMP version
+  ofile=`echo $file | sed  -e 's,\(.*\)_omp\.h,\1.h,' -e 's,\(.*\)_omp\.cpp,\1.cpp,'`
+  if (test ! -e ../$ofile) then
+    if (test -e ../$file) then
+      echo "  removing src/$file"
+      rm -f ../$file
+    fi
+  else
+    if (test ! -e ../$file) then
+      echo "  creating src/$file"
+      cp $file ..
+    elif ! cmp -s $file ../$file ; then
+      echo "  updating src/$file"
+      cp $file ..
+    fi
+  fi
+done
+
+# special case for files not covered by the automatic script above
+for file in thr_data.h thr_data.cpp thr_omp.h thr_omp.cpp; do
+  if (test ! -e ../$file) then
+    echo "  creating src/$file"
+    cp $file ..
+  elif ! cmp -s $file ../$file ; then
+    echo "  updating src/$file"
+    cp $file ..
+  fi
+done
+