Check for Text::Diff in configure script.
diff --git a/TODO b/TODO
index 9bfef9b..64b281f 100644
--- a/TODO
+++ b/TODO
@@ -29,7 +29,6 @@
* function to copy file from one archive to another
* do not compress if storing is smaller
* set O_CLOEXEC flag after fopen and mkstemp
-* check for Text::Diff in configure script
! W test extra fields api
. set
diff --git a/configure.ac b/configure.ac
index a2b9749..c3e5f4a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -110,6 +110,8 @@
gl_VISIBILITY
+AX_PERL_MODULE_VERSION([Text::Diff 1.41], , AC_MSG_ERROR([The Text::Diff perl module is needed by the test framework. Please install it.]))
+
AC_CONFIG_FILES([Makefile
libzip.pc
libzip-uninstalled.pc
diff --git a/m4/ax_perl_module_version.m4 b/m4/ax_perl_module_version.m4
new file mode 100644
index 0000000..356e695
--- /dev/null
+++ b/m4/ax_perl_module_version.m4
@@ -0,0 +1,85 @@
+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_perl_module_version.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_PERL_MODULE_VERSION([MODULE VERSION], [ACTION-IF-TRUE], [ACTION-IF-FALSE])
+#
+# DESCRIPTION
+#
+# Checks to see if the list of 'Module Version' are avaiable in the
+# system. If all the modules in the list are avaiable ACTION-IF-TRUE is
+# executed. Case one module is not avaiable ACTION-IF-FALSE is executed
+# and the macro execution is aborted. NOTE: Perl is needed.
+#
+# Example:
+#
+# AX_PERL_MODULE_VERSION(CGI::Test 0.104 CGI::Ajax 0.694, ,
+# AC_MSG_ERROR(Need some Perl modules))
+#
+# LICENSE
+#
+# Copyright (c) 2009 Marco Gomes <mpglesi@gmail.com>
+# Copyright (c) 2009 Ruben Fonseca <fonseka@gmail.com>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 5
+
+AU_ALIAS([AC_PERL_MODULE_VERSION], [AX_PERL_MODULE_VERSION])
+AC_DEFUN([AX_PERL_MODULE_VERSION],[dnl
+ac_perl_list_modules="$1"
+# Make sure we have perl
+if test -z "$PERL"; then
+AC_CHECK_PROG(PERL,perl,perl)
+fi
+
+# Check the number of arguments
+#args_num=`echo $ac_perl_list_modules | wc -w`
+#let "ckeck_args = $args_num % 2"
+#if test "$check_args" = "1" ; then
+# AC_MSG_ERROR(syntax error)
+#else
+ eval
+#fi
+
+if test "x$PERL" != x; then
+ ac_failed=0
+ while test ${#ac_perl_list_modules} -gt 2 ; do
+ module_name=`echo $ac_perl_list_modules | cut -d " " -f 1`
+ module_version=`echo $ac_perl_list_modules | cut -d " " -f 2`
+ ac_perl_list_modules=`echo $ac_perl_list_modules | cut -d " " -f 3-`
+ AC_MSG_CHECKING(for perl module $module_name version $module_version)
+
+ $PERL "-M$module_name" -e exit > /dev/null 2>&1
+ if test $? -ne 0; then
+ AC_MSG_RESULT(no);
+ ac_failed=1
+ ac_perl_list_modules=""
+ else
+ version=`$PERL "-M$module_name" -e 'print $'"$module_name::VERSION" 2>&1`
+ $PERL -e 'exit(shift cmp shift)' "$version" "$module_version"
+ if test $? -eq 0 -o $? -eq 1 ; then
+ AC_MSG_RESULT(ok);
+ else
+ AC_MSG_RESULT(no)
+ ac_failed=1
+ ac_perl_list_modules=""
+ fi
+ fi;
+ done
+
+ if test "$ac_failed" = 0; then
+ :
+ $2
+ else
+ :
+ $3
+ fi
+else
+ AC_MSG_ERROR(could not find perl)
+fi])dnl