fix building under non-FreeBSD platforms

postfix/postfix.spec

@@ -102,7 +102,8 @@ Provides:     MTA
         -e 's;/usr/include;%{l_prefix}/include;g' \
         makedefs
     %{l_shtool} subst \
-        -e 's;#define HAS_DB;;' \
+        -e 's;#define HAS_DBM;#define HAS_DBM_DISABLED;' \
+        -e 's;#define HAS_DB;#define HAS_DB_DISABLED;' \
         src/util/sys_defs.h
 
 %build