Index: libarchive-3.4.0/CMakeLists.txt
===================================================================
--- libarchive-3.4.0.orig/CMakeLists.txt
+++ libarchive-3.4.0/CMakeLists.txt
@@ -71,7 +71,7 @@ SET(LIBARCHIVE_VERSION_STRING  "${VERSIO
 # libarchive 2.9 == interface version 11 = 2 + 9
 # libarchive 3.0 == interface version 12
 # libarchive 3.1 == interface version 13
-math(EXPR INTERFACE_VERSION  "13 + ${_minor}")
+set(INTERFACE_VERSION  "13")
 
 # Set SOVERSION == Interface version
 # ?? Should there be more here ??