X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2FMakefile;h=dc13cc1561ad288013ab4681a6885f83578a5341;hp=8d6f2ccd2f60da89d179693bdb6bc2a618e44407;hb=ea99a55173ebdcfe60f3b3d6f6c979f5d7785d48;hpb=42fb6dce8110e29ccf233c09e6d6b1d58d9e5fef

diff --git a/matita/matita/contribs/lambdadelta/Makefile b/matita/matita/contribs/lambdadelta/Makefile
index 8d6f2ccd2..dc13cc156 100644
--- a/matita/matita/contribs/lambdadelta/Makefile
+++ b/matita/matita/contribs/lambdadelta/Makefile
@@ -186,7 +186,7 @@ define SUMMARY_TEMPLATE
   $$(SUM_$(1)): S2 = $$(word 2, $$(C0))
   $$(SUM_$(1)): S3 = $$(word 3, $$(C0))
   $$(SUM_$(1)): S4 = $$(word 4, $$(C0))
-  $$(SUM_$(1)): S5 = $$(shell printf "%.1f" `echo "scale=2;$$(S4)/$$(S2)"|bc`)
+  $$(SUM_$(1)): S5 = $$(shell printf "%.1f" `echo "scale=2;if($$(S2)!=0)$$(S4)/$$(S2) else 0"|bc`)
   $$(SUM_$(1)): C1 = $$(word 5, $$(C0))
   $$(SUM_$(1)): C2 = $$(word 7, $$(C0))
   $$(SUM_$(1)): C3 = $$(shell echo "$$(C1)+$$(C2)"|bc)