Index: src/sqliteInt.h
==================================================================
--- src/sqliteInt.h
+++ src/sqliteInt.h
@@ -752,11 +752,13 @@
 #endif
 #ifndef SQLITE_MAX_MMAP_SIZE
 # if defined(__linux__) \
   || defined(_WIN32) \
   || (defined(__APPLE__) && defined(__MACH__)) \
-  || defined(__sun)
+  || defined(__sun) \
+  || defiend(__FreeBSD__) \
+  || defined(__DragonFly__)
 #   define SQLITE_MAX_MMAP_SIZE 0x7fff0000  /* 2147418112 */
 # else
 #   define SQLITE_MAX_MMAP_SIZE 0
 # endif
 # define SQLITE_MAX_MMAP_SIZE_xc 1 /* exclude from ctime.c */