--- tcptraceroute-tcptraceroute-1.5beta7.orig/configure.ac	2026-10-18 06:21:45.837772852 +0200
+++ tcptraceroute-tcptraceroute-1.5beta7/configure.ac	2026-10-18 06:21:45.850838152 +0200
@@ -148,11 +148,10 @@ AC_CHECK_FUNCS([gettimeofday memset sele
 
 # Is this Solaris?
 AC_MSG_CHECKING(for Solaris)
-AC_RUN_IFELSE([AC_LANG_PROGRAM( [], [
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM( [], [
 #if defined (__SVR4) && defined (__sun)
-	exit(0);
 #else
-	exit(-1);
+#error no match
 #endif
 		])
 	],[
@@ -165,11 +164,10 @@ AC_RUN_IFELSE([AC_LANG_PROGRAM( [], [
 
 # Is this BSDI?
 AC_MSG_CHECKING(for BSDI)
-AC_RUN_IFELSE([AC_LANG_PROGRAM( [], [
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM( [], [
 #if defined (__bsdi__)
-	exit(0);
 #else
-	exit(-1);
+#error no match
 #endif
 		])
 	],[
@@ -182,11 +180,10 @@ AC_RUN_IFELSE([AC_LANG_PROGRAM( [], [
 
 # Is this NetBSD?
 AC_MSG_CHECKING(for NetBSD)
-AC_RUN_IFELSE([AC_LANG_PROGRAM( [], [
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM( [], [
 #if defined (__NetBSD__)
-	exit(0);
 #else
-	exit(-1);
+#error no match
 #endif
 		])
 	],[
@@ -199,11 +196,10 @@ AC_RUN_IFELSE([AC_LANG_PROGRAM( [], [
 
 # Is this MacOS X?
 AC_MSG_CHECKING(for MacOS X)
-AC_RUN_IFELSE([AC_LANG_PROGRAM( [], [
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM( [], [
 #if defined (__APPLE__) && defined (__MACH__)
-	exit(0);
 #else
-	exit(-1);
+#error no match
 #endif
 		])
 	],[