tolerate missing ps2pdf

diff --git a/contrib/prune/Makefile.am b/contrib/prune/Makefile.am
index 4e35dd2c2afe601f7c2ea201c0c872971f1ce54e..98bcb36141209a82580dbcd34215561af8cb90af 100644 (file)
--- a/contrib/prune/Makefile.am
+++ b/contrib/prune/Makefile.am
@@ -21,7 +21,7 @@ prune_LDADD = $(top_builddir)/lib/ingraphs/libingraphs_C.la \
        $(top_builddir)/lib/cdt/libcdt.la
 
 .1.pdf:
-       groff -Tps -man $< | ps2pdf - - >$@
+       -groff -Tps -man $< | ps2pdf - - >$@
 
 EXTRA_DIST = $(man_MANS) $(pdf_DATA) Makefile.old Makefile.orig README test.dot