Added Erik de Castro Lopo's float_cast.h to use lrintf() when available. Also
disables the synthesis on the encoder side when pitch is disabled.
diff --git a/acinclude.m4 b/acinclude.m4
new file mode 100644
index 0000000..1346177
--- /dev/null
+++ b/acinclude.m4
@@ -0,0 +1,44 @@
+dnl @synopsis AC_C99_FUNC_LRINTF
+dnl
+dnl Check whether C99's lrintf function is available.
+dnl @version 1.1
+dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
+dnl
+dnl Permission to use, copy, modify, distribute, and sell this file for any
+dnl purpose is hereby granted without fee, provided that the above copyright
+dnl and this permission notice appear in all copies. No representations are
+dnl made about the suitability of this software for any purpose. It is
+dnl provided "as is" without express or implied warranty.
+dnl
+AC_DEFUN([AC_C99_FUNC_LRINTF],
+[AC_CACHE_CHECK(for lrintf,
+ ac_cv_c99_lrintf,
+[AC_TRY_COMPILE([
+#define _ISOC9X_SOURCE 1
+#define _ISOC99_SOURCE 1
+#define __USE_ISOC99 1
+#define __USE_ISOC9X 1
+#include <math.h>],
+[ int value = lrintf (0.432) ; ], ac_cv_c99_lrintf=yes, ac_cv_c99_lrintf=no)])
+if test $ac_cv_c99_lrintf = yes; then
+ AC_DEFINE(HAVE_LRINTF, 1,
+ [Define if you have C99's lrintf function.])
+fi
+])# AC_C99_LRINTF
+
+AC_DEFUN([AC_C99_FUNC_LRINT],
+[AC_CACHE_CHECK(for lrint,
+ ac_cv_c99_lrint,
+[AC_TRY_COMPILE([
+#define _ISOC9X_SOURCE 1
+#define _ISOC99_SOURCE 1
+#define __USE_ISOC99 1
+#define __USE_ISOC9X 1
+#include <math.h>],
+[ int value = lrint (0.432) ; ], ac_cv_c99_lrint=yes, ac_cv_c99_lrint=no)])
+if test $ac_cv_c99_lrint = yes; then
+ AC_DEFINE(HAVE_LRINT, 1,
+ [Define if you have C99's lrint function.])
+fi
+])# AC_C99_LRINT
+