[Bug 504160] [NEW] Compiling ocamlnet on ubuntu karmic, Error with rpclocal.c

[ben]

Public bug reported:

Trying to build ocamlnet-2.2.9 from sources on ubuntu karmic throws the
following

error
------
$ make all
[...]
rpclocal.c:91: error: dereferencing pointer to incomplete type
rpclocal.c:129: error: ‘SCM_CREDENTIALS’ undeclared (first use in this function)
rpclocal.c:129: error: (Each undeclared identifier is reported only once
rpclocal.c:129: error: for each function it appears in.)
rpclocal.c:135: error: dereferencing pointer to incomplete type
rpclocal.c:136: error: dereferencing pointer to incomplete type
[...]
(Entire log is below)

workaround
---------------
Add the following line on top of rpclocal.c:

$ vim src/rpc-auth-local/rpclocal.c
  #define _GNU_SOURCE

reproduction
----------------
    wget http://download.camlcity.org/download/ocamlnet-2.2.9.tar.gz
    tar xfvz ocamlnet-2.2.9.tar.gz && cd ocamlnet-2.2.9
    ./configure
    make all

specs
--------
### pcre
$ cat /usr/local/lib/ocaml/3.11.1/pcre/META  | grep version
version="6.0.1"

### type-conv
$ cat /usr/local/lib/ocaml/3.11.1/type-conv/META | grep version
version = "1.6.10"

### ocaml
$ ocamlc -v
The Objective Caml compiler, version 3.11.1
Standard library directory: /usr/lib/ocaml

### ubuntu
$ lsb_release -d
Description:    Ubuntu 9.10

### gcc
gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu8) 


Entire error log:
rpclocal.c: In function ‘unix_get_peer_credentials’:
rpclocal.c:40: error: storage size of ‘credentials’ isn’t known
rpclocal.c:42: error: invalid application of ‘sizeof’ to incomplete type ‘struct ucred’ 
rpclocal.c:40: warning: unused variable ‘credentials’
rpclocal.c: In function ‘unix_peek_peer_credentials’:
rpclocal.c:91: error: dereferencing pointer to incomplete type
rpclocal.c:129: error: ‘SCM_CREDENTIALS’ undeclared (first use in this function)
rpclocal.c:129: error: (Each undeclared identifier is reported only once
rpclocal.c:129: error: for each function it appears in.)
rpclocal.c:135: error: dereferencing pointer to incomplete type
rpclocal.c:136: error: dereferencing pointer to incomplete type
rpclocal.c:91: warning: unused variable ‘buf’
make[1]: *** [rpclocal.o] Error 2
make: *** [all] Error 2

** Affects: ocamlnet (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Compiling ocamlnet on ubuntu karmic, Error with rpclocal.c
https://bugs.launchpad.net/bugs/504160
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