build: Fix configure.ac to require md5 if hcache is enabled

Fixes: #261

diff --git a/configure.ac b/configure.ac
index 10266a30e8a50f4001a8779ca82942400511d1f8..4d552610049617e2fbd7e808c6e363a915c1555b 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1118,6 +1118,7 @@ AM_CONDITIONAL(BUILD_HCACHE, test -n "$hcache_db_used")
 if test -n "$hcache_db_used"; then
   AC_DEFINE(USE_HCACHE, 1, [Enable header caching])
   MUTT_LIB_OBJECTS="$MUTT_LIB_OBJECTS hcache.o"
+  need_md5="yes"
 else
   # For outputting in the summary
   hcache_db_used="no"