diff --git a/config.h.cmake.in b/config.h.cmake.in
new file mode 100644
index 0000000..87aa9d5
--- /dev/null
+++ b/config.h.cmake.in
@@ -0,0 +1,6 @@
+#cmakedefine HAVE_INET_ATON
+#cmakedefine HAVE_INET_NTOP
+#cmakedefine HAVE_SNPRINTF
+#cmakedefine HAVE_STRCASECMP
+#cmakedefine HAVE_STRNCASECMP
+#cmakedefine HAVE_VSNPRINTF