applied the configure-lua patch to the lua branch

Makefile.am

@@ -1,4 +1,4 @@
-SUBDIRS = include src examples tests
+SUBDIRS = include src bindings examples tests
 
 EXTRA_DIST=\
 	CMakeLists.txt \

configure.ac

@@ -108,6 +108,34 @@ AS_IF([test "x$with_valgrind" != xno],
       ])
 AM_CONDITIONAL(USE_VALGRIND, test "x$VALGRIND" != x)
 
+dnl Check for lua
+AC_MSG_CHECKING(if with lua)
+AC_ARG_WITH(lua, AC_HELP_STRING([--with-lua],[lua]),
+[WITH_LUA=$withval],[WITH_LUA=no])
+
+if test "$WITH_LUA" != "no"; then
+ AC_MSG_RESULT($WITH_LUA)
+ # try pkgconfig
+ if test "$WITH_LUA" = "yes"; then
+    LUAPC=lua
+  else
+    LUAPC=$WITH_LUA
+  fi
+
+ PKG_CHECK_MODULES(LUA, $LUAPC >= 5.1, [
+   AC_DEFINE([HAVE_LUA], [1], [liblua])
+   AC_DEFINE([HAVE_LUA_H], [1], [lua.h])
+ ],[
+   PKG_CHECK_MODULES(LUA, lua5.1 >= 5.1, [
+     AC_DEFINE([HAVE_LUA], [1], [liblua])
+     AC_DEFINE([HAVE_LUA_H], [1], [lua.h])
+   ]) 
+ ])
+
+ AC_SUBST(LUA_CFLAGS)
+ AC_SUBST(LUA_LIBS)
+fi
+
 AC_CONFIG_FILES([
 Makefile
 include/Makefile
@@ -126,6 +154,8 @@ src/os/win32/Makefile
 examples/Makefile
 src/sigar_version_autoconf.c
 tests/Makefile
+bindings/Makefile
+bindings/lua/Makefile
 ])
 
 AC_OUTPUT