speed up incremental underlaypo runs

diff --git a/Makefile.PL b/Makefile.PL
index b2d027bc4d8843d592e395d82f3073783bbea510..4021a0a5df6a49929272b3fc9a9180ac8eea5e6d 100755 (executable)
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -58,6 +58,7 @@ underlaypo: ikiwiki.out
        install -d po/underlays/directives/ikiwiki/directive
        for file in doc/ikiwiki/directive/*; do \
                if [ -f "$$file" ]; then \
+                       cp -a $$file po/underlays/directives/ikiwiki/directive ||  \
                        install -m 644 $$file po/underlays/directives/ikiwiki/directive; \
                fi \
        done