diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_SIGACTION.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_SIGACTION.h
new file mode 100644
index 0000000..7a3b847
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_SIGACTION.h
@@ -0,0 +1,18 @@
+// HAVE_SIGACTION : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_SIGACTION
+
+/* Since POSIX.1 (OpenBSD, FreeBSD, NetBSD, Mac OS X),
+ * glibc 1.09
+ */
+#if defined(__FreeBSD__)            || \
+    defined(__OpenBSD__)            || \
+    defined(__NetBSD__)             || \
+    defined(BUILD2_AUTOCONF_MACOS)  || \
+    BUILD2_AUTOCONF_GLIBC_PREREQ(1, 09)
+#  define HAVE_SIGACTION 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRSEP.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRSEP.h
new file mode 100644
index 0000000..84e083a
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRSEP.h
@@ -0,0 +1,18 @@
+// HAVE_STRSEP : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_STRSEP
+
+/* Since 4.4BSD (OpenBSD, FreeBSD, NetBSD, Mac OS X),
+ * glibc 1.09
+ */
+#if defined(__FreeBSD__)            || \
+    defined(__OpenBSD__)            || \
+    defined(__NetBSD__)             || \
+    defined(BUILD2_AUTOCONF_MACOS)  || \
+    BUILD2_AUTOCONF_GLIBC_PREREQ(1, 09)
+#  define HAVE_STRSEP 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOK.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOK.h
new file mode 100644
index 0000000..7a5d213
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOK.h
@@ -0,0 +1,18 @@
+// HAVE_STRTOK : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_STRTOK
+
+/* Since 4.4BSD (OpenBSD, FreeBSD, NetBSD, Mac OS X),
+ * glibc 2.0
+ */
+#if defined(__FreeBSD__)            || \
+    defined(__OpenBSD__)            || \
+    defined(__NetBSD__)             || \
+    defined(BUILD2_AUTOCONF_MACOS)  || \
+    BUILD2_AUTOCONF_GLIBC_PREREQ(2, 0)
+#  define HAVE_STRTOK 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOK_R.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOK_R.h
new file mode 100644
index 0000000..cb4fca3
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOK_R.h
@@ -0,0 +1,18 @@
+// HAVE_STRTOK_R : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_STRTOK_R
+
+/* Since 4.4BSD (OpenBSD, FreeBSD, NetBSD, Mac OS X),
+ * glibc 2.0
+ */
+#if defined(__FreeBSD__)            || \
+    defined(__OpenBSD__)            || \
+    defined(__NetBSD__)             || \
+    defined(BUILD2_AUTOCONF_MACOS)  || \
+    BUILD2_AUTOCONF_GLIBC_PREREQ(2, 0)
+#  define HAVE_STRTOK_R 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOL.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOL.h
new file mode 100644
index 0000000..81b357a
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOL.h
@@ -0,0 +1,18 @@
+// HAVE_STRTOL : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_STRTOL
+
+/* Since 'ISO C90' (OpenBSD, FreeBSD, NetBSD, Mac OS X),
+ * glibc 1.90
+ */
+#if defined(__FreeBSD__)            || \
+    defined(__OpenBSD__)            || \
+    defined(__NetBSD__)             || \
+    defined(BUILD2_AUTOCONF_MACOS)  || \
+    BUILD2_AUTOCONF_GLIBC_PREREQ(1, 90)
+#  define HAVE_STRTOL 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOLL.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOLL.h
new file mode 100644
index 0000000..6b29b74
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_STRTOLL.h
@@ -0,0 +1,18 @@
+// HAVE_STRTOLL : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_STRTOLL
+
+/* Since 'ISO C99' (OpenBSD ~2.7, FreeBSD ~4.0, NetBSD ~1.5, Mac OS X ~10.0),
+ * glibc 1.90
+ */
+#if BUILD2_AUTOCONF_OPENBSD_PREREQ(200015) || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(4, 0)   || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(1, 5)    || \
+    BUILD2_AUTOCONF_MACOS_PREREQ(10, 0)    || \
+    BUILD2_AUTOCONF_GLIBC_PREREQ(1, 90)
+#  define HAVE_STRTOLL 1
+#endif