Fix some more references!

cmake/scripts/index.rst.in

@@ -10,6 +10,8 @@ Introduction
 
 @CMAKE_DOC_DEPENDENCIES@
 
+.. _variableref:
+
 Input Variable reference
 ========================
 .. toctree::
@@ -18,6 +20,8 @@ Input Variable reference
 
    variables/*
 
+.. _commandref:
+
 Command reference
 =================
 .. toctree::
@@ -26,6 +30,8 @@ Command reference
 
    commands/*
 
+.. _moduleref:
+
 Module reference
 ================
 .. toctree::

doc/buildsystem/dune-common.rst

@@ -33,7 +33,7 @@ any call to CMake. There, you can define variables for the configure process wit
 with the C pre-processor.
 
 The most important part of the configure flags is to tell the build system where to look for external libraries.
-You can browse the :ref:`input variables` section of this documentation for a list of variables that are picked up
+You can browse the :ref:`variableref` section of this documentation for a list of variables that are picked up
 by the Dune CMake build system.
 
 .. _whatfiles:
@@ -297,7 +297,7 @@ showing the output of failed tests.
 Although this is not the CMake-ish way, :code:`make test` also builds the tests before executing them.
 This behavior will change in the near future.
 
-.. disable:
+.. _disable:
 
 Can I disable an external dependency?
 =====================================
@@ -324,7 +324,7 @@ installed MPI library, you have to explicitly disable the corresponding find mod
 .. code-block:
    -DCMAKE_DISABLE_FIND_PACKAGE_MPI=TRUE
 
-in the :ref:`CMAKE_FLAGS` of your opts file, as described in section :ref:`disable`.
+in the :code:`CMAKE_FLAGS` of your opts file, as described in section :ref:`disable`.
 
 .. _headercheck: