Faststack memory alloc is configure option now;

configure.ac

@@ -23,6 +23,13 @@ AS_IF([test "x$enable_build_examples" = "xyes"], [
   AC_DEFINE([BUILD_EXAMPLES], 1, [build of examples enabled])
 ])
 
+AC_ARG_ENABLE([faststack_alloc],
+    AS_HELP_STRING([--enable-faststack-alloc], [Use faststack thread-safe alloc within parser]))
+
+AS_IF([test "x$enable_faststack_alloc" = "xyes"], [
+    AC_DEFINE([USE_FASTSTACK_ALLOC], 1, [using faststack allocation within parser])
+])
+
 AC_OUTPUT([
 Makefile
 lib/libsexpr.pc

lib/parser.c

@@ -40,6 +40,12 @@ LA-CC-04-094
 #include <sexpr/sexp.h>
 #include <sexpr/faststack.h>
 
+#include <config.h>
+
+#ifndef USE_FASTSTACK_ALLOC
+#define _NO_MEMORY_MANAGEMENT_  1
+#endif
+
 /* we need a locks in this case and we don't have ability to change API */
 #ifndef _NO_MEMORY_MANAGEMENT_
 #include <pthread.h>