diff --git a/INSTALL.md b/INSTALL.md
index d31616bb..0e8d5c2b 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -27,7 +27,8 @@ Perl modules (install from CPAN if needed e.g. `perl -MCPAN -e 'install X'`):
   * type:
 
         $ export ARCHFLAGS="-arch x86_64" (replace x86_64 by your arch)
-        $ brew/port install pkg-config libao
+        $ brew install pkg-config libao # for [Homebrew](https://github.com/mxcl/homebrew)
+        $ port install libao # for [MacPorts](http://www.macports.org/)
         $ make
         $ perl -MCPAN -e 'install Crypt::OpenSSL::RSA'
         $ perl -MCPAN -e 'install IO::Socket::INET6'
diff --git a/shairport.pl b/shairport.pl
index 07401fe5..a7d00297 100755
--- a/shairport.pl
+++ b/shairport.pl
@@ -261,7 +261,7 @@ sub conn_handle_request {
     my ($fh, $conn) = @_;
 
     my $req = $conn->{req};;
-    my $clen = $req->header('content-length') // 0;
+    my $clen = $req->header('content-length') || 0;
     if ($clen > 0 && !length($req->content)) {
         $conn->{req_need} = $clen;
         return; # need more!