diff --git a/tests/testcurl.pl b/tests/testcurl.pl
index 79ff7769ad3fe7195971c48af06ee5dfa9bf1d3d..2eea52970c21c5be146a6997f7fe78cea165ae42 100755
--- a/tests/testcurl.pl
+++ b/tests/testcurl.pl
@@ -492,6 +492,16 @@ if ($configurebuild) {
     # lib/Makefile.netware now copies curlbuild.h.dist as curlbuild.h
     system("$make -i -C lib -f Makefile.$targetos prebuild");
     system("$make -i -C src -f Makefile.$targetos prebuild");
+    # peek compiler predefined symbols...
+    system("echo | gcc -m32 -E -dM - >predef.txt");
+    logit "display predef.txt";
+    if(open(F, "predef.txt")) {
+        while (<F>) {
+            print;
+        }
+        close(F);
+    }
+    #
   }
 }