diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_CLOSE_RANGE.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_CLOSE_RANGE.h
new file mode 100644
index 0000000..2444e52
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_CLOSE_RANGE.h
@@ -0,0 +1,14 @@
+// HAVE_CLOSE_RANGE : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_CLOSE_RANGE
+
+/* Since FreeBSD 12.2 (based on their online manual pages) and glibc 2.34.
+ */
+#if BUILD2_AUTOCONF_FREEBSD_PREREQ(12, 2) || \
+    BUILD2_AUTOCONF_GLIBC_PREREQ(2, 34)
+#  define HAVE_CLOSE_RANGE 1
+#endif