Index: build/dbm.m4
===================================================================
--- build/dbm.m4	(revision 569502)
+++ build/dbm.m4	(working copy)
@@ -232,6 +232,7 @@
     LIBS="$LIBS -l$apu_try_berkeley_db_libname"
     AC_TRY_RUN(
       [
+#include <stdlib.h>
 #include <stdio.h>
 #include <$apu_try_berkeley_db_header>
 main ()