diff --git a/SRC/configure b/SRC/configure
index 489e10a..57538d0 100755
--- a/SRC/configure
+++ b/SRC/configure
@@ -1746,12 +1746,14 @@ echo "configure:1746: checking T/TCP" >&5
 cat > conftest.$ac_ext <<EOF
 #line 1748 "configure"
 #include "confdefs.h"
-#include <sys/socket.h>
+#include <sys/types.h>
+  #include <sys/socket.h>
+ 
 int main() {
 int foobar = MSG_EOF;
 ; return 0; }
 EOF
-if { (eval echo configure:1755: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1757: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define TTCP 1
diff --git a/SRC/configure.in b/SRC/configure.in
index 2376335..33b879a 100644
--- a/SRC/configure.in
+++ b/SRC/configure.in
@@ -46,7 +46,9 @@ AC_CHECK_FUNCS(gettimeofday socket sigaction)
 dnl T/TCP
 AC_MSG_CHECKING([T/TCP])
 AC_TRY_COMPILE(
- [#include <sys/socket.h>],
+ [#include <sys/types.h>
+  #include <sys/socket.h>
+ ],
  [int foobar = MSG_EOF;],
  [AC_DEFINE(TTCP),ac_have_ttcp=yes],
  ac_have_ttcp=no)