diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LLRINT.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LLRINT.h
new file mode 100644
index 0000000..b3709be
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LLRINT.h
@@ -0,0 +1,18 @@
+// HAVE_LLRINT : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_LLRINT
+
+/* Since glibc 2.1, FreeBSD 5.4, OpenBSD 3.9, NetBSD 3.1 and MacOS, Win32.
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 1)     || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(5, 4)   || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200601) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(3, 1)    || \
+    defined(BUILD2_AUTOCONF_MACOS)         || \
+    defined(_WIN32)
+#  define HAVE_LLRINT 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LLRINTF.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LLRINTF.h
new file mode 100644
index 0000000..d943f29
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LLRINTF.h
@@ -0,0 +1,18 @@
+// HAVE_LLRINTF : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_LLRINTF
+
+/* Since glibc 2.1, FreeBSD 5.4, OpenBSD 3.9, NetBSD 3.1 and MacOS, Win32.
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 1)     || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(5, 4)   || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200601) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(3, 1)    || \
+    defined(BUILD2_AUTOCONF_MACOS)         || \
+    defined(_WIN32)
+#  define HAVE_LLRINTF 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LRINT.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LRINT.h
new file mode 100644
index 0000000..604585a
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LRINT.h
@@ -0,0 +1,18 @@
+// HAVE_LRINT : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_LRINT
+
+/* Since glibc 2.1, FreeBSD 5.4, OpenBSD 3.9, NetBSD 3.1 and MacOS, Win32.
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 1)     || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(5, 4)   || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200601) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(3, 1)    || \
+    defined(BUILD2_AUTOCONF_MACOS)         || \
+    defined(_WIN32)
+#  define HAVE_LRINT 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LRINTF.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LRINTF.h
new file mode 100644
index 0000000..be4bded
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LRINTF.h
@@ -0,0 +1,18 @@
+// HAVE_LRINTF : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_LRINTF
+
+/* Since glibc 2.1, FreeBSD 5.4, OpenBSD 3.9, NetBSD 3.1 and MacOS, Win32.
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 1)     || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(5, 4)   || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200601) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(3, 1)    || \
+    defined(BUILD2_AUTOCONF_MACOS)         || \
+    defined(_WIN32)
+#  define HAVE_LRINTF 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LSTAT.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LSTAT.h
new file mode 100644
index 0000000..9d8a2a6
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_LSTAT.h
@@ -0,0 +1,13 @@
+// HAVE_LSTAT : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_LSTAT
+
+/* Since glibc 2.19.
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 19)
+#  define HAVE_LSTAT 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_MMX.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_MMX.h
new file mode 100644
index 0000000..9ad6359
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_MMX.h
@@ -0,0 +1,11 @@
+// HAVE_MMX
+
+#undef HAVE_MMX
+
+/* Assumed to be available on anything x86 or x86_64.
+ */
+#if defined(_M_X64) || defined(__amd64__) || defined(i386)
+#  define HAVE_MMX 1
+#else
+#  define HAVE_MMX 0
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_MMXEXT.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_MMXEXT.h
new file mode 100644
index 0000000..e1a5822
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_MMXEXT.h
@@ -0,0 +1,11 @@
+// HAVE_MMXEXT
+
+#undef HAVE_MMXEXT
+
+/* Assumed to be available on anything x86 or x86_64.
+ */
+#if defined(_M_X64) || defined(__amd64__) || defined(i386)
+#  define HAVE_MMXEXT 1
+#else
+#  define HAVE_MMXEXT 0
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_RINT.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_RINT.h
new file mode 100644
index 0000000..b60d1c2
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_RINT.h
@@ -0,0 +1,18 @@
+// HAVE_RINT : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_RINT
+
+/* Since glibc 2.19, FreeBSD 1.0, OpenBSD 2.2, NetBSD 1.3 and MacOS, Win32.
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 19)     || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(1, 0)   || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(199712) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(1, 3)    || \
+    defined(BUILD2_AUTOCONF_MACOS)         || \
+    defined(_WIN32)
+#  define HAVE_RINT 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TRUNC.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TRUNC.h
new file mode 100644
index 0000000..d5e1ce6
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TRUNC.h
@@ -0,0 +1,18 @@
+// HAVE_TRUNC : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_TRUNC
+
+/* Since glibc 2.1, FreeBSD 5.3, OpenBSD 4.0, NetBSD 4.0 and MacOS, Win32.
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 1)     || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(5, 3)   || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200611) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(4, 0)    || \
+    defined(BUILD2_AUTOCONF_MACOS)         || \
+    defined(_WIN32)
+#  define HAVE_TRUNC 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TRUNCF.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TRUNCF.h
new file mode 100644
index 0000000..604967a
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_TRUNCF.h
@@ -0,0 +1,18 @@
+// HAVE_TRUNCF : BUILD2_AUTOCONF_LIBC_VERSION
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_TRUNCF
+
+/* Since glibc 2.1, FreeBSD 5.3, OpenBSD 4.0, NetBSD 4.0 and MacOS, Win32.
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 1)     || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(5, 3)   || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200611) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(4, 0)    || \
+    defined(BUILD2_AUTOCONF_MACOS)         || \
+    defined(_WIN32)
+#  define HAVE_TRUNCF 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_WINRT.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_WINRT.h
new file mode 100644
index 0000000..aba7c6f
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_WINRT.h
@@ -0,0 +1,7 @@
+// HAVE_WINRT
+
+#undef HAVE_WINRT
+
+#if defined(_WINRT_DLL_)
+#  define HAVE_WINRT 1
+#endif