kdoctools: Perl is a propagated *run*-time dep

It was improperly classified a build-time dep to get around the
incorrect propagation logic that was in place before this PR.

Additionally fix some `kdoctools` usage were it is incorrectly used a
run-time dep.

3 files changed, 18 insertions, 7 deletions

diff --git a/pkgs/applications/kde/libkcddb.nix b/pkgs/applications/kde/libkcddb.nix
index edd9732d051b..3fd486056542 100644
--- a/pkgs/applications/kde/libkcddb.nix
+++ b/pkgs/applications/kde/libkcddb.nix
@@ -8,8 +8,8 @@ mkDerivation {
     license = with licenses; [ gpl2 lgpl21 bsd3 ];
     maintainers = with maintainers; [ peterhoeg ];
   };
-  nativeBuildInputs = [ extra-cmake-modules ];
-  buildInputs = [ qtbase kdoctools ];
+  nativeBuildInputs = [ extra-cmake-modules kdoctools ];
+  buildInputs = [ qtbase ];
   propagatedBuildInputs = [
     kcodecs ki18n kio kwidgetsaddons
     libmusicbrainz5
diff --git a/pkgs/applications/office/skrooge/default.nix b/pkgs/applications/office/skrooge/default.nix
index f88cc1470981..1aaf05a123e1 100644
--- a/pkgs/applications/office/skrooge/default.nix
+++ b/pkgs/applications/office/skrooge/default.nix
@@ -14,9 +14,12 @@ mkDerivation rec {
     sha256 = "1dbvdrkdpgv39v8h7k3mri0nzlslfyd5kk410czj0jdn4qq400md";
   };
 
-  nativeBuildInputs = [ cmake extra-cmake-modules shared_mime_info ];
+  nativeBuildInputs = [
+    cmake extra-cmake-modules kdoctools shared_mime_info
+  ];
 
-  buildInputs = [ qtwebkit qtscript grantlee kxmlgui kwallet kparts kdoctools
+  buildInputs = [
+    qtwebkit qtscript grantlee kxmlgui kwallet kparts
     kjobwidgets kdesignerplugin kiconthemes knewstuff sqlcipher qca-qt5
     kactivities karchive kguiaddons knotifyconfig krunner kwindowsystem libofx
   ];
diff --git a/pkgs/development/libraries/kde-frameworks/kdoctools/default.nix b/pkgs/development/libraries/kde-frameworks/kdoctools/default.nix
index 661e89e30782..0a600fe8d057 100644
--- a/pkgs/development/libraries/kde-frameworks/kdoctools/default.nix
+++ b/pkgs/development/libraries/kde-frameworks/kdoctools/default.nix
@@ -8,10 +8,18 @@
 mkDerivation {
   name = "kdoctools";
   meta = { maintainers = [ lib.maintainers.ttuegel ]; };
-  nativeBuildInputs = [ extra-cmake-modules ];
-  propagatedNativeBuildInputs = [ perl perlPackages.URI ];
+  nativeBuildInputs = [
+    extra-cmake-modules
+    # The build system insists on having native Perl.
+    perl perlPackages.URI
+  ];
+  propagatedBuildInputs = [
+    # kdoctools at runtime actually needs Perl for the platform kdoctools is
+    # running on, not necessarily native perl.
+    perl perlPackages.URI
+    qtbase
+  ];
   buildInputs = [ karchive ki18n ];
-  propagatedBuildInputs = [ qtbase ];
   outputs = [ "out" "dev" ];
   patches = [ ./kdoctools-no-find-docbook-xml.patch ];
   cmakeFlags = [