--- libelwix/configure.in	2013/01/17 10:05:35	1.1.1.1
+++ libelwix/configure.in	2022/02/01 20:46:57	1.60
@@ -1,11 +1,14 @@
 #
 # $Author: misho $
-# $Id: configure.in,v 1.1.1.1 2013/01/17 10:05:35 misho Exp $
+# $Id: configure.in,v 1.60 2022/02/01 20:46:57 misho Exp $
 #
-AC_INIT(libelwix, 1.0, misho@elwix.org)
+AC_INIT(libelwix, 5.3, misho@elwix.org)
 AC_CONFIG_SRCDIR([src/elwix.c])
 AC_CONFIG_HEADERS([inc/config.h])
 
+ac_cv_func_malloc_0_nonnull="yes"
+ac_cv_func_realloc_0_nonnull="yes"
+
 # Checks for programs.
 AC_PROG_CC
 AC_PROG_INSTALL
@@ -14,11 +17,11 @@ AC_PROG_RANLIB
 AC_CANONICAL_HOST
 AC_CANONICAL_TARGET
 
-AC_CHECK_TOOL(MKDEP, mkdep, no)
+AC_CHECK_TOOL(MKDEP, mkdep, ../mkdep)
 AC_SUBST(MKDEP)
 
-CFLAGS="-Wall -O2 -fPIC -I/usr/local/include ${CFLAGS}"
-LDFLAGS="-L/usr/local/lib ${LDFLAGS}"
+CFLAGS="-Wall -O2 -fPIC ${CFLAGS}"
+LDFLAGS="${LDFLAGS}"
 
 AC_CHECK_LIB([pthread], [pthread_mutex_init])
 
@@ -31,7 +34,7 @@ AC_C_INLINE
 # Checks for library functions.
 AC_FUNC_MALLOC
 AC_FUNC_REALLOC
-AC_CHECK_FUNCS([memset regcomp strchr strerror])
+AC_CHECK_FUNCS([memset regcomp strchr strerror link_addr])
 
 DEBUG=no
 AC_MSG_CHECKING(Debug Build)
@@ -47,6 +50,22 @@ AC_ARG_ENABLE(debug,
 				;;
 		esac ],)
 AC_MSG_RESULT($DEBUG)
+
+MEMMGR="elwix"
+AC_MSG_CHECKING(Memory management)
+AC_ARG_WITH(memmgr,
+	[  --with-memmgr=<mm>      Memory manager for ELWIX (elwix|system)], 
+	[ case "$withval" in
+		sys|system)
+			MEMMGR="system"
+			AC_DEFINE(MEMMGR, ELWIX_SYSM, [ELWIX memory manager])
+			;;
+		*)
+			MEMMGR="elwix"
+			AC_DEFINE(MEMMGR, ELWIX_MPOOL, [ELWIX memory manager])
+			;;
+	  esac ], AC_DEFINE(MEMMGR, ELWIX_MPOOL, [ELWIX memory manager]))
+AC_MSG_RESULT($MEMMGR)
 
 AC_CONFIG_FILES([Makefile
                  inc/Makefile