(install): Copy updated files only.

1 files changed, 17 insertions, 3 deletions

diff --git a/admin/charsets/Makefile b/admin/charsets/Makefile
index 771a876f762..6def349d96d 100644
--- a/admin/charsets/Makefile
+++ b/admin/charsets/Makefile
@@ -313,9 +313,23 @@ EBCDIC%.map: ${GLIBC_CHARMAPS}/EBCDIC-% mapconv compact.awk
         # Generating $@...
         @mapconv $< '/^<.*[     ]\/x/' GLIBC-1 compact.awk > $@
 
-install: ${CHARSETS} ${TRANS_TABLE}
-        cp ${CHARSETS} ../../etc/charsets
-        cp ${TRANS_TABLE} ../../lisp/international
+install:
+        @for f in ${CHARSETS}; do \
+          if test -r $$f; then \
+            if ! cmp -s $$f ../../etc/charsets/$$f; then \
+              echo updating $$f; \
+              cp $$f ../../etc/charsets; \
+            fi; \
+          fi; \
+        done
+        @for f in ${TRANS_TABLE}; do \
+          if test -r $$f; then \
+            if ! cmp -s $$f ../../lisp/international/$$f; then \
+              echo updating $$f; \
+              cp $$f ../../lisp/international; \
+            fi; \
+          fi; \
+        done
 
 # Clear files that are automatically generated.
 clean: