diff --git a/configure.ac b/configure.ac
index fd8a7169..ecb71eca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,7 +31,7 @@ AC_PROG_LIBTOOL
 # Checks for header files.
 #
 AC_HEADER_STDC
-AC_CHECK_HEADERS([ctype.h endian.h netinet/in.h stdint.h stdlib.h string.h strings.h sys/endian.h sys/socket.h sys/time.h termios.h unistd.h])
+AC_CHECK_HEADERS([ctype.h endian.h netinet/in.h stdint.h stdlib.h string.h strings.h sys/byteorder.h sys/endian.h sys/socket.h sys/time.h termios.h unistd.h])
 
 # Type checks.
 #
diff --git a/fko/fko_common.h b/fko/fko_common.h
index 940555e9..eaffa7cb 100644
--- a/fko/fko_common.h
+++ b/fko/fko_common.h
@@ -63,6 +63,15 @@
 #elif HAVE_SYS_ENDIAN_H /* FreeBSD has a sys/endian.h */
   #include <sys/endian.h>
   #define BYTEORDER _BYTE_ORDER
+#elif HAVE_SYS_BYTEORDER_H /* Solaris (v10 at least) seems to have this */
+  #include <sys/byteorder.h>
+  #if defined(_BIG_ENDIAN)
+    #define BYTEORDER 4321
+  #elif defined(_LITTLE_ENDIAN)
+    #define BYTEORDER 1234
+  #else
+    #error unable to determine BYTEORDER
+  #endif
 #endif
 
 /* Convenient macros for wrapping sections in 'extern "C" {' constructs.