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[led-pattern-ed] / m4 / vala.m4

diff --git a/m4/vala.m4 b/m4/vala.m4
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--- /dev/null
+++ b/m4/vala.m4
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+# Autoconf support for the Vala compiler
+
+# Copyright (C) 2008, 2009 Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 4
+
+# Check whether the Vala compiler exists in `PATH'. If it is found, the
+# variable VALAC is set. Optionally a minimum release number of the
+# compiler can be requested.
+#
+# AM_PROG_VALAC([MINIMUM-VERSION])
+# --------------------------------
+AC_DEFUN([AM_PROG_VALAC],
+[AC_PATH_PROG([VALAC], [valac], [])
+ AS_IF([test -z "$VALAC"],
+   [AC_MSG_WARN([No Vala compiler found.  You will not be able to compile .vala source files.])],
+   [AS_IF([test -n "$1"],
+      [AC_MSG_CHECKING([$VALAC is at least version $1])
+       am__vala_version=`$VALAC --version | sed 's/Vala  *//'`
+       AS_VERSION_COMPARE([$1], ["$am__vala_version"],
+         [AC_MSG_RESULT([yes])],
+         [AC_MSG_RESULT([yes])],
+         [AC_MSG_RESULT([no])
+          AC_MSG_ERROR([Vala $1 not found.])])])])
+])