gtk-doc.patch

diff --git a/pkgs/development/libraries/libical/correct-gtk-doc.patch b/pkgs/development/libraries/libical/correct-gtk-doc.patch
new file mode 100644
index 00000000000..fcb7b2b0775
--- /dev/null
+++ b/pkgs/development/libraries/libical/correct-gtk-doc.patch
@@ -0,0 +1,15 @@
+diff --git a/doc/reference/libical-glib/CMakeLists.txt b/doc/reference/libical-glib/CMakeLists.txt
+index 4013d570..a2f7ceec 100644
+--- a/doc/reference/libical-glib/CMakeLists.txt
++++ b/doc/reference/libical-glib/CMakeLists.txt
+@@ -76,9 +76,8 @@ endif()
+ add_custom_target(documentation ALL
+   COMMAND ${GTKDOC_FIXXREF}
+     --module=libical-glib
+-    --module-dir=.
++    --module-dir=html
+     --extra-dir=..
+-    --html-dir=${OUTPUT_DOCDIR}
+   DEPENDS html/index.html
+   COMMENT "Generating libical-glib documentation"
+   )
diff --git a/pkgs/development/libraries/libical/default.nix b/pkgs/development/libraries/libical/default.nix
index 8ca3dd72754..73544ae46b5 100644
--- a/pkgs/development/libraries/libical/default.nix
+++ b/pkgs/development/libraries/libical/default.nix
@@ -30,6 +30,7 @@ stdenv.mkDerivation rec {
     # TODO: upstream this patch
     # https://github.com/libical/libical/issues/350
     ./respect-env-tzdir.patch
+    ./correct-gtk-doc.patch
   ];
 
   # Using install check so we do not have to manually set