diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TIMERADD.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TIMERADD.h
new file mode 100644
index 0000000..8c8bba8
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TIMERADD.h
@@ -0,0 +1,17 @@
+// HAVE_TIMERADD : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_TIMERADD
+
+/* Since Linux/glibc 2.1, OpenBSD 2.9, FreeBSD 5.0, NetBSD 6.0 and Mac OS
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 1) || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(5, 0) || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200106) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(6, 0) || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_TIMERADD 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TIMERCLEAR.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TIMERCLEAR.h
new file mode 100644
index 0000000..5f17c6f
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TIMERCLEAR.h
@@ -0,0 +1,17 @@
+// HAVE_TIMERCLEAR : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_TIMERCLEAR
+
+/* Since Linux/glibc 2.1, OpenBSD 2.9, FreeBSD 5.0, NetBSD 6.0 and Mac OS
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 1) || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(5, 0) || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200106) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(6, 0) || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_TIMERCLEAR 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TIMERISSET.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TIMERISSET.h
new file mode 100644
index 0000000..a11dcc1
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TIMERISSET.h
@@ -0,0 +1,17 @@
+// HAVE_TIMERISSET : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_TIMERISSET
+
+/* Since Linux/glibc 2.1, OpenBSD 2.9, FreeBSD 5.0, NetBSD 6.0 and Mac OS
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 1) || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(5, 0) || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200106) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(6, 0) || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_TIMERISSET 1
+#endif