Update installation.rst

Fix installation requirements

#15

docs/content/installation.rst

@@ -18,14 +18,19 @@ Required
 * `eckit`_
 * `eccodes`_
 * `metkit`_
+* `atlas`_
 
 .. index:: Dependencies; Optional
 
 Optional
 ~~~~~~~~
 
 * MPI
-* `fdb`_
+* `fdb`_ (`-DENABLE_FDB5=ON`. Default: ON)
+* `fckit`_ (if fortran is enabled `-DENABLE_FORTRAN=ON`. Default: ON)
+* `atlas-orca`_ (to enable downloading (e)ORCA grids with atlas)
+* `mir`_ (for interpolation `-DENABLE_MIR=ON`. Default: ON)
+* `pgen`_ (internal, `-DENABLE_PGEN=ON`, Default: OFF)
 
 .. index:: Build, Install
    :name: build-install
@@ -61,4 +66,9 @@ Build & Install
 .. _`eckit`: https://github.com/ecmwf/eckit
 .. _`eccodes`: https://github.com/ecmwf/eccodes
 .. _`metkit`: https://github.com/ecmwf/metkit
+.. _`atlas`: https://github.com/ecmwf/atlas
+.. _`atlas-orca`: https://github.com/ecmwf/atlas-orca
 .. _`fdb`: https://github.com/ecmwf/fdb
+.. _`mir`: https://github.com/ecmwf/mir
+.. _`pgen`: https://github.com/ecmwf/pgen
+.. _`fckit`: https://github.com/ecmwf/fckit