diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..7ad08f8
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,101 @@
+#                                               -*- Autoconf -*-
+# Process this file with autoconf to produce a configure script.
+
+AC_PREREQ([2.65])
+AC_INIT([mingw-w64], [1.0b], [mingw-w64-public@lists.sourceforge.net])
+AC_CONFIG_AUX_DIR([build-aux])
+AC_CONFIG_SRCDIR([AUTHORS])
+AC_CONFIG_HEADERS([config.h])
+
+AM_MAINTAINER_MODE
+AM_INIT_AUTOMAKE([foreign])
+
+AC_CANONICAL_HOST
+
+# Checks for programs.
+
+# Checks for libraries.
+
+# Checks for header files.
+
+# Checks for typedefs, structures, and compiler characteristics.
+
+# Checks for library functions.
+
+AC_MSG_CHECKING([whether to build the headers])
+AC_ARG_WITH([headers],
+  [AS_HELP_STRING([--without-headers],
+    [Skip building the mingw-w64 headers])],
+  [],
+  [with_headers=yes])
+AS_CASE([$with_headers],
+  [yes],[AC_CONFIG_SUBDIRS([mingw-w64-headers])],
+  [no],[],
+  [AC_MSG_ERROR([Invalid argument to --with-headers: $with_headers])])
+AM_CONDITIONAL([HEADER],[test "x$with_headers" = xyes])
+AC_MSG_RESULT([$with_headers])
+
+AC_MSG_CHECKING([whether to build the crt])
+AC_ARG_WITH([crt],
+  [AS_HELP_STRING([--without-crt],
+    [Skip building the mingw-w64 crt])],
+  [],
+  [with_crt=yes])
+AS_CASE([$with_crt],
+  [yes],[AC_CONFIG_SUBDIRS([mingw-w64-crt])],
+  [no],[],
+  [AC_MSG_ERROR([Invalid argument to --with-crt: $with_crt])])
+AM_CONDITIONAL([CRT],[test "x$with_crt" = xyes])
+AC_MSG_RESULT([$with_crt])
+
+AC_MSG_CHECKING([whether to build the optional libraries])
+AC_ARG_WITH([libraries],
+  [AS_HELP_STRING([--with-libraries=ARG],
+    [Build the extra mingw-w64 libs, where ARG is one of libmangle, pseh, or all])],
+  [],
+  [with_libraries=no])
+AS_CASE([$with_libraries],
+  [yes|all],[
+    with_libraries="libmangle,pseh"
+    with_libraries_mangle=yes
+    with_libraries_pseh=yes],
+  [libmangle],[
+    with_libraries="libmangle"
+    with_libraries_mangle=yes
+    with_libraries_pseh=no],
+  [pseh],[
+    with_libraries="pseh"
+    with_libraries_mangle=no
+    with_libraries_pseh=yes],
+  [no],[
+    with_libraries_mangle=no
+    with_libraries_pseh=no],
+  [AC_MSG_ERROR([Invalid argument to --with-libraries: $with_libraries])])
+AM_CONDITIONAL([LIBRARIES_MANGLE],[test "x$with_libraries_mangle" = xyes])
+AM_CONDITIONAL([LIBRARIES_PSEH],[test "x$with_libraries_pseh" = xyes])
+AM_COND_IF([LIBRARIES_MANGLE],[AC_CONFIG_SUBDIRS([mingw-w64-libraries/libmangle])])
+AM_COND_IF([LIBRARIES_PSEH],[AC_CONFIG_SUBDIRS([mingw-w64-libraries/pseh])])
+AC_MSG_RESULT([$with_libraries])
+
+AC_MSG_CHECKING([whether to build the optional tools])
+AC_ARG_WITH([tools],
+  [AS_HELP_STRING([--with-tools=ARG],
+    [Build the extra mingw-w64 tools, where ARG is one of gendef, or all])],
+  [],
+  [with_tools=no])
+AS_CASE([$with_tools],
+  [yes|all],[
+    with_tools="gendef"
+    with_tools_gendef=yes],
+  [gendef],[
+    with_tools="gendef"
+    with_tools_gendef=yes],
+  [no],[
+    with_tools_gendef=no],
+  [AC_MSG_ERROR([Invalid argument to --with-tools: $with_tools])])
+AM_CONDITIONAL([TOOLS_GENDEF],[test "x$with_tools_gendef" = xyes])
+AM_COND_IF([TOOLS_GENDEF],[AC_CONFIG_SUBDIRS([mingw-w64-tools/gendef])])
+AC_MSG_RESULT([$with_tools])
+
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT