#i120589# Improved detection of missing perl modules.

configure.in

@@ -1958,12 +1958,27 @@ AC_SUBST(PERL)
 
 dnl ===================================================================
 dnl Testing for required Perl modules
+dnl The list of required Perl modules is documented here:
+dnl     http://wiki.openoffice.org/wiki/Documentation/Building_Guide_AOO#General_Build_Requirements
 dnl ===================================================================
 AC_MSG_CHECKING([for required Perl modules])
-if `$PERL -e 'use Archive::Zip; use LWP::UserAgent;'`; then
+if `$PERL -e 'use Archive::Zip; use LWP::UserAgent; use XML::Parser;'>/dev/null 2>&1`; then
 	AC_MSG_RESULT([all modules found])
 else
-	AC_MSG_ERROR([Failed to find some modules])
+    # Find out which modules are missing.
+    missing_perl_modules=
+    if ! `$PERL -e 'use Archive::Zip;'>/dev/null 2>&1`; then
+       missing_perl_modules=Archive::Zip
+    fi
+    if ! `$PERL -e 'use LWP::UserAgent;'>/dev/null 2>&1`; then
+       missing_perl_modules="$missing_perl_modules LWP::UserAgent"
+    fi
+    if ! `$PERL -e 'use XML::Parser;'>/dev/null 2>&1`; then
+       missing_perl_modules="$missing_perl_modules XML::Parser"
+    fi
+	AC_MSG_ERROR([
+    The missing Perl modules are: $missing_perl_modules
+    Install them as superuser/administrator with "cpan -i $missing_perl_modules"])
 fi
 
 dnl ===================================================================