make configure failed, but ./configure works good

[dk]

I try to create port sysutils/avfs (avf.sourceforge.net) for using virtual  
file system in x11-fm/worker.
when I try to build it traditional way(./configure ; make && make install  
) it configures, makes, installs and works properly


Here is my 1st Makefile
-------------8<-----------
PORTNAME=       avfs
PORTVERSION=    0.9.8
PORTREVISION=   1
CATEGORIES=     sysutils
MASTER_SITES=   ${MASTER_SITE_SOURCEFORGE}
MASTER_SITE_SUBDIR=     avf

USE_BZIP2=      yes
USE_GMAKE=      yes
GNU_CONFIGURE=	yes	
MAINTAINER=     lazyklimm at gmail.com
COMMENT=        A Virtual File System

CONFIGURE_ARGS= --enable-library --prefix=${LOCALBASE}
.include <bsd.port.mk>
---------------8<-----------

make configure talks:
.....SKIPPED......
checking for zipinfo code in unzip... yes
checking for perl... /usr/bin/perl
./configure.lineno: 39: Syntax error: "}" unexpected (expecting "then")
===>  Script "configure" failed unexpectedly.
Please report the problem to lazyklimm at gmail.com [maintainer] and attach  
the
"/usr/ports/sysutils/avfs/work/avfs-0.9.8/config.log" including the output
of the failure of your make command. Also, it might be a good idea to  
provide
an overview of all packages installed on your system (e.g. an `ls
/var/db/pkg`).
*** Error code 1

Stop in /usr/ports/sysutils/avfs.
*** Error code 1

Stop in /usr/ports/sysutils/avfs.
-------

I made a dirty hack like this:
--------8<--------------------
PORTNAME=       avfs
PORTVERSION=    0.9.8
PORTREVISION=   1
CATEGORIES=     sysutils
MASTER_SITES=   ${MASTER_SITE_SOURCEFORGE}
MASTER_SITE_SUBDIR=     avf

USE_BZIP2=      yes
USE_GMAKE=      yes
#GNU_CONFIGURE= yes
MAINTAINER=     lazyklimm at gmail.com
COMMENT=        A Virtual File System

CONFIGURE_ARGS= --enable-library --prefix=${LOCALBASE}
post-patch:
#Here comes very dirty hack, Children, never try to build ports like this
                 cd ${WRKSRC} && ./configure ${CONFIGURE_ARGS}


.include <bsd.port.mk>
-----------8<----------------------

It works pretty good


Here is b64encoded gzipped port

begin-base64 644 avfs.tgz
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J3zrPvKMNo3gcVlVFV8ygUAgEAgEAoFAIBAIBAKBQCB45C/k3x6NACgAAA==
====