diff --git a/install.py b/install.py
index db32988..a8aaa03 100755
--- a/install.py
+++ b/install.py
@@ -311,6 +311,12 @@ class Installer:
 
         self.base_dir.chdir()
 
+    def do_dependency(self, *programs: str) -> None:
+        """Process a program from the config file as a dependency of another program."""
+
+        for program in programs:
+            self._process_program(program)
+
     def do_symlink(self, src: str, dest: str, condition: str = "true") -> None:
         """Make a symlink to a file."""
 
@@ -403,14 +409,14 @@ class Installer:
             programs = list(self.conf.keys())
             for program in programs:
                 if ui.ask_yes_no("Do you wish to install {}?".format(program)):
-                    self.process_program(program)
+                    self._process_program(program)
                 else:
                     ui.info_2("Skipping {}".format(program))
         else:
             for program in programs:
-                self.process_program(program)
+                self._process_program(program)
 
-    def process_program(self, program: str) -> None:
+    def _process_program(self, program: str) -> None:
         """Install one program (called by self.process()).
 
         Call indivdual methods from the conf file.