diff --git a/auto/summary b/auto/summary
index 19afd04..28fe5f5 100644
--- a/auto/summary
+++ b/auto/summary
@@ -2,6 +2,12 @@
 echo
 echo "Configuration summary"
 
+case $PCRE in
+    YES) echo " + using system PCRE library" ;;
+    NO)  echo " + PCRE library is not found" ;;
+    *)   echo " + using PCRE library: $PCRE" ;;
+esac
+
 case $MD5 in
     YES) echo " + using system md5 library" ;;
     NO)  echo " + md5 library is not found" ;;