build: Replace non-portable cp -d

Signed-off-by: Jens Georg <mail@jensge.org>
https://bugzilla.gnome.org/show_bug.cgi?id=722527

diff --git a/doc/reference/doc-build.am b/doc/reference/doc-build.am
index 0bae4eb..ab95f1d 100644 (file)
--- a/doc/reference/doc-build.am
+++ b/doc/reference/doc-build.am
@@ -66,7 +66,7 @@ all: valadoc-gen gtkdoc-gen
 # The chmod corrects the directory permissions so that distcheck can remove the installed files.
 install-data-hook: gtkdoc/html/index.html
        $(MKDIR_P) $(RYGEL_GTKDOC_INSTALL_DIR)
-       cp -d -R $(srcdir)/gtkdoc/html/* $(RYGEL_GTKDOC_INSTALL_DIR)
+       cp -p -R $(srcdir)/gtkdoc/html/* $(RYGEL_GTKDOC_INSTALL_DIR)
        chmod -R u+w $(RYGEL_GTKDOC_INSTALL_DIR)
 
 else