build: Replace another cp -d

Signed-off-by: Jens Georg <mail@jensge.org>

diff --git a/doc/reference/doc-build.am b/doc/reference/doc-build.am
index ab95f1d..de896d9 100644 (file)
--- a/doc/reference/doc-build.am
+++ b/doc/reference/doc-build.am
@@ -72,7 +72,7 @@ install-data-hook: gtkdoc/html/index.html
 else
 install-data-hook:
        test -d $(srcdir)/gtkdoc/html && $(MKDIR_P) $(RYGEL_GTKDOC_INSTALL_DIR); true
-       test -d $(srcdir)/gtkdoc/html && cp -d -R $(srcdir)/gtkdoc/html/* $(RYGEL_GTKDOC_INSTALL_DIR); true
+       test -d $(srcdir)/gtkdoc/html && cp -p -R $(srcdir)/gtkdoc/html/* $(RYGEL_GTKDOC_INSTALL_DIR); true
        test -d $(srcdir)/gtkdoc/html && chmod -R u+w $(RYGEL_GTKDOC_INSTALL_DIR); true
 
 endif