copy .h files only if needed

diff --git a/zypp/Makefile.am b/zypp/Makefile.am
index 74196b1..7594d14 100644 (file)
--- a/zypp/Makefile.am
+++ b/zypp/Makefile.am
@@ -165,3 +165,26 @@ lib@PACKAGE@_la_LIBADD =        base/lib@PACKAGE@_base.la  \
 
 EXTRA_DIST = @DOXYGEN/*
 
+#<INSTALL-HEADER-TARGET>
+
+# Automatically inserted by insert_install_target
+# DO NOT REMOVE THE TAGS!
+
+# Install header files only if different to version already installed -
+# prevent unnecessary installations to keep make dependency changes
+# and thus rebuilds for dependent packages as low as possible.
+
+install-pkgincludeHEADERS: $(pkginclude_HEADERS)
+       @$(NORMAL_INSTALL)
+       $(mkinstalldirs) $(DESTDIR)$(pkgincludedir)
+       @list='$(pkginclude_HEADERS)';                                                  \
+       for p in $$list; do                                                             \
+               if test -f "$$p"; then d= ; else d="$(srcdir)/"; fi;                    \
+               if ! cmp -s $$d$$p $(DESTDIR)$(pkgincludedir)/$$p; then                 \
+                       echo " $(INSTALL_DATA) $$d$$p $(DESTDIR)$(pkgincludedir)/$$p";  \
+                       $(INSTALL_DATA) $$d$$p $(DESTDIR)$(pkgincludedir)/$$p;          \
+               fi                                                                      \
+       done
+
+#</INSTALL-HEADER-TARGET>
+