#define htolel(x) (x)
#define htoles(x) (x)
#else
-#ifdef HAVE_BYTESWAP_H
+#if defined(HAVE_BYTESWAP_H)
#include <byteswap.h>
#define letohl(x) bswap_32(x)
#define letohs(x) bswap_16(x)
#define htolel(x) bswap_32(x)
#define htoles(x) bswap_16(x)
-#elif HAVE_SYS_ENDIAN_SWAP16
+#elif defined(HAVE_SYS_ENDIAN_SWAP16)
#include <sys/endian.h>
#define letohl(x) __swap32(x)
#define letohs(x) __swap16(x)
#define htolel(x) __swap32(x)
#define htoles(x) __swap16(x)
-#elif HAVE_SYS_ENDIAN_BSWAP16
+#elif defined(HAVE_SYS_ENDIAN_BSWAP16)
#include <sys/endian.h>
#define letohl(x) bswap32(x)
#define letohs(x) bswap16(x)