diff --git a/npa/configure.ac b/npa/configure.ac
index 0fc0c2d..d5b31a6 100644
--- a/npa/configure.ac
+++ b/npa/configure.ac
@@ -159,7 +159,7 @@ AC_TYPE_UINT8_T
 # Checks for library functions.
 AC_FUNC_MALLOC
 AC_FUNC_REALLOC
-AC_CHECK_FUNCS([getline memmove memset strerror gettimeofday strtol])
+AC_CHECK_FUNCS([getline memmove memset strerror gettimeofday strtol strlcpy])
 
 AC_SUBST(DYN_LIB_EXT)
 case "$host" in
diff --git a/npa/src/boxing.c b/npa/src/boxing.c
index c0c1c81..f88dbc5 100644
--- a/npa/src/boxing.c
+++ b/npa/src/boxing.c
@@ -33,6 +33,10 @@
 /* FIXME might not always work */
 #define htole16(x) (x)
 #define htole32(x) (x)
+#elif __APPLE__
+#include <libkern/OSByteOrder.h>
+#define htole16(x) OSSwapHostToLittleInt16(x)
+#define htole32(x) OSSwapHostToLittleInt32(x)
 #else
 #ifndef _BSD_SOURCE
 #define _BSD_SOURCE             /* See feature_test_macros(7) */