tolerate an error touching a file in a read-only srcdir

bk: 4f0785daI2lqOyevRKbrgKivjF8Yaw

diff --git a/libntp/Makefile.am b/libntp/Makefile.am
index 9efbc16a37863fe2ee7b2d76d696ba2fdcdf0053..ea750f0f9489b6b0ffcda8ce3370dda759c8c032 100644 (file)
--- a/libntp/Makefile.am
+++ b/libntp/Makefile.am
@@ -125,7 +125,7 @@ EXTRA_DIST = README
 # dependency.
 
 systime_s.c: systime.c
-       @touch $@
+       -@touch $@
 
 include $(top_srcdir)/depsver.mf
 include $(top_srcdir)/includes.mf