diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_VASPRINTF.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_VASPRINTF.h
new file mode 100644
index 0000000..1a7b681
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_VASPRINTF.h
@@ -0,0 +1,17 @@
+// HAVE_VASPRINTF : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_VASPRINTF
+
+/*  Since glibc 2.1, FreeBSD 2.2, OpenBSD 2.9, NetBSD 1.4 and MacOS
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 1)     || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(2, 2)   || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200106) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(1, 4)    || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_VASPRINTF 1
+#endif