Check perl module

[Rudra Banerjee]

Hi,

In my configure.ac, I want to check in this perl module exiftool (http:
//search.cpan.org/~exiftool/Image-ExifTool-10.20/lib/Image/ExifTool.pod
) exists as:

AX_PROG_PERL_MODULES( Image::ExifTool, ,)

But this is giving error:

./configure: line 4071: syntax error near unexpected token
`Image::ExifTool,'
./configure: line 4071: `AX_PROG_PERL_MODULES( Image::ExifTool, ,)'
What is going wrong here?

For reference, here is my complete configure.ac

AC_INIT([mkbib], [0.1],[],[mkbib])
AM_INIT_AUTOMAKE([1.9.6 dist-bzip2 subdir-objects])
AM_PATH_PYTHON([3.0])
AM_PATH_GTK_3_0([3.4.0],,AC_MSG_ERROR([Gtk+ 3.0.0 or higher
required.]))
AX_PROG_PERL_MODULES( Image::ExifTool, ,)

GLIB_GSETTINGS
AC_CONFIG_FILES([Makefile 
                 data/Makefile
                 data/mkbib.desktop
                 data/icons/Makefile
                 data/icons/hicolor/Makefile
                 data/icons/hicolor/48x48/Makefile
                 data/icons/hicolor/48x48/apps/Makefile
                 data/icons/hicolor/scalable/Makefile
                 data/icons/hicolor/scalable/apps/Makefile
                 data/ui/Makefile
                 ])
AC_OUTPUT