Fix ModuleManager failing when:

- LWP::Simple is not installed.
- Crypt::SSLeay or IO::Socket::SSL are not installed.

This fixes #154.

make/configure.pm

@@ -31,7 +31,7 @@ use warnings FATAL => qw(all);
 use Exporter 'import';
 use POSIX;
 use make::utilities;
-our @EXPORT = qw(promptnumeric dumphash is_dir getmodules getrevision getcompilerflags getlinkerflags getdependencies nopedantic resolve_directory yesno showhelp promptstring_s);
+our @EXPORT = qw(promptnumeric dumphash is_dir getmodules getrevision getcompilerflags getlinkerflags getdependencies nopedantic resolve_directory yesno showhelp promptstring_s module_installed);
 
 my $no_git = 0;
 
@@ -193,6 +193,13 @@ sub promptnumeric($$)
 	}
 }
 
+sub module_installed($)
+{
+	my $module = shift;
+	eval("use $module;");
+	return !$@;
+}
+
 sub promptstring_s($$)
 {
 	my ($prompt,$default) = @_;

modulemanager

@@ -21,10 +21,22 @@
 
 use strict;
 use warnings FATAL => qw(all);
-use LWP::Simple;
 
 use make::configure;
 
+
+if (!module_installed("LWP::Simple"))
+{
+	die "Your system is missing the LWP::Simple Perl module!";
+}
+
+if (!module_installed("Crypt::SSLeay") && !module_installed("IO::Socket::SSL"))
+{
+	die "Your system is missing the Crypt::SSLeay or IO::Socket::SSL Perl modules!";
+}
+
+use LWP::Simple;
+
 our @modlist;
 
 my %installed;