diff --git a/configure.ac b/configure.ac
index 130e1bf..bf75415 100644
--- a/configure.ac
+++ b/configure.ac
@@ -612,6 +612,9 @@ AC_ARG_WITH(gssapi,
 	    [LIBS="$oLIBS -lgssapi"
 	    AC_MSG_CHECKING(for gssapi library -lgssapi)
 	    AC_TRY_LINK([#include <gssapi/gssapi.h>
+			 #ifdef STDC_HEADERS
+			 #include <stddef.h>
+			 #endif
 		],[gss_create_empty_oid_set(NULL, NULL)],
 		[AC_MSG_RESULT(yes)
 		cons_with_gssapi="YES"
@@ -621,6 +624,9 @@ AC_ARG_WITH(gssapi,
 		LIBS="$oLIBS -lgssglue"
 		AC_MSG_CHECKING(for gssapi library -lgssglue)
 		AC_TRY_LINK([#include <gssapi/gssapi.h>
+			     #ifdef STDC_HEADERS
+			     #include <stddef.h>
+			     #endif
 		    ],[gss_create_empty_oid_set(NULL, NULL)],
 		    [AC_MSG_RESULT(yes)
 		    cons_with_gssapi="YES"
@@ -630,6 +636,9 @@ AC_ARG_WITH(gssapi,
 		    LIBS="$oLIBS -lgss"
 		    AC_MSG_CHECKING(for gssapi library -lgss)
 		    AC_TRY_LINK([#include <gssapi/gssapi.h>
+				 #ifdef STDC_HEADERS
+				 #include <stddef.h>
+				 #endif
 			],[gss_create_empty_oid_set(NULL, NULL)],
 			[AC_MSG_RESULT(yes)
 			cons_with_gssapi="YES"