diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index aaa0885072..28c3d6c027 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -376,6 +376,7 @@ pkg_depends(DIELECTRIC EXTRA-PAIR)
 pkg_depends(CG-DNA MOLECULE)
 pkg_depends(CG-DNA ASPHERE)
 pkg_depends(ELECTRODE KSPACE)
+pkg_depends(EXTRA-MOLECULE MOLECULE)
 
 # detect if we may enable OpenMP support by default
 set(BUILD_OMP_DEFAULT OFF)
diff --git a/src/EXTRA-MOLECULE/Install.sh b/src/EXTRA-MOLECULE/Install.sh
new file mode 100644
index 0000000000..b70754eae5
--- /dev/null
+++ b/src/EXTRA-MOLECULE/Install.sh
@@ -0,0 +1,40 @@
+# Install/unInstall package files in LAMMPS
+# mode = 0/1/2 for uninstall/install/update
+
+mode=$1
+
+# enforce using portable C locale
+LC_ALL=C
+export LC_ALL
+
+# arg1 = file, arg2 = file it depends on
+
+action () {
+  if (test $mode = 0) then
+    rm -f ../$1
+  elif (! cmp -s $1 ../$1) then
+    if (test -z "$2" || test -e ../$2) then
+      cp $1 ..
+      if (test $mode = 2) then
+        echo "  updating src/$1"
+      fi
+    fi
+  elif (test -n "$2") then
+    if (test ! -e ../$2) then
+      rm -f ../$1
+    fi
+  fi
+}
+
+# some styles in EXTRA-MOLECULE have base classes in MOLECULE 
+
+if (test $1 = 1) then
+  if (test ! -e ../bond_fene.cpp) then
+    echo "Must install MOLECULE package with EXTRA-MOLECULE package"
+    exit 1
+  fi
+fi
+
+for file in *.cpp *.h; do
+    action ${file}
+done