diff --git a/.cvsignore b/.cvsignore
index 09aa8e5..875e7bd 100644
--- a/.cvsignore
+++ b/.cvsignore
@@ -21,3 +21,4 @@ havesendfile.h
 trysendfile
 havealloca.h
 uudecode
+haveuint128.h
diff --git a/tryuint128.c b/tryuint128.c
new file mode 100644
index 0000000..cffc794
--- /dev/null
+++ b/tryuint128.c
@@ -0,0 +1 @@
+__uint128_t tmp;