Set proper deptypes for certain build systems (#3866)

* Set proper deptypes for certain build systems

* Add depends_on to namespace

lib/spack/spack/build_systems/perl.py

@@ -27,7 +27,7 @@
 import os
 
 from llnl.util.filesystem import join_path
-from spack.directives import extends
+from spack.directives import depends_on, extends
 from spack.package import PackageBase, run_after
 from spack.util.executable import Executable
 
@@ -64,6 +64,8 @@ class PerlPackage(PackageBase):
 
     extends('perl')
 
+    depends_on('perl', type=('build', 'run'))
+
     def configure_args(self):
         """Produces a list containing the arguments that must be passed to
         :py:meth:`~.PerlPackage.configure`. Arguments should not include

lib/spack/spack/build_systems/python.py

@@ -26,7 +26,7 @@
 import inspect
 import os
 
-from spack.directives import extends
+from spack.directives import depends_on, extends
 from spack.package import PackageBase, run_after
 
 from llnl.util.filesystem import working_dir
@@ -114,6 +114,8 @@ def configure(self, spec, prefix):
 
     extends('python')
 
+    depends_on('python', type=('build', 'run'))
+
     def setup_file(self):
         """Returns the name of the setup file to use."""
         return 'setup.py'

lib/spack/spack/build_systems/r.py

@@ -25,7 +25,7 @@
 
 import inspect
 
-from spack.directives import extends
+from spack.directives import depends_on, extends
 from spack.package import PackageBase, run_after
 
 
@@ -47,6 +47,8 @@ class RPackage(PackageBase):
 
     extends('r')
 
+    depends_on('r', type=('build', 'run'))
+
     def install(self, spec, prefix):
         """Installs an R package."""
         inspect.getmodule(self).R(