Compiling OpenVPN for QNX Neutrino

OpenVPN is an open-source application to securely tunnel IP networks over a single TCP/UDP port, with support for SSL/TLS-based session authentication and key exchange, packet encryption, packet authentication, and packet compression. Here's how to compile it for QNX Neutrino:

Download the OpenVPN source from http://swupdate.openvpn.org/community/releases/openvpn-2.3.11.tar.gz.

Untar the file, and then enter the created directory:

tar -zxvf openvpn-2.3.11.tar.gz
cd openvpn-2.3.11

Create a build-hooks script to set target-specific settings for the addvariant tool:

Add the io-pkt directory to include paths for types_bsd.h.
Set fork_works to yes for QNX targets.
Disable auth-pam for QNX targets.

For example:

echo '#!/bin/ksh
function hook_preconfigure {
     CPPFLAGS="$CPPFLAGS -I$QNX_TARGET/usr/include/io-pkt"
     configure_opts="${configure_opts} --disable-plugin-auth-pam"
     configure_opts="${configure_opts} ac_cv_func_fork_works=yes"
}
' > build-hooks
chmod 777 build-hooks

Add the QNX Neutrino target type to the configure script. Edit this file, search for the *-*-linux*) line, and add the following above it:

    *-*-qnx*)
 
$as_echo "#define TARGET_QNXNTO 1" >>confdefs.h
 
 
cat >>confdefs.h <<_ACEOF
#define TARGET_PREFIX "Q"
_ACEOF
 
        ;;

Add QNX Neutrino target to the config.h.in file. This change defines TARGET_NETBSD, so that QNX Neutrino is handled like NetBSD. Search for Are we running on, and add the following:
```
/* Are we running on QNX Neutrino? */
#undef TARGET_QNXNTO

#ifdef TARGET_QNXNTO
/* QNX mirrors the NetBSD implementation */
#define TARGET_NETBSD
#endif

  
```
Update the source to include the NetBSD headers; edit src/openvpn/tun.c, search for PR 32944, and add the following after #elif defined (TARGET_NETBSD):
```
#ifdef TARGET_QNXNTO
#include <sys/types_bsd.h>
#endif

  
```
Update IV_PLAT to indicate QNX Neutrino; edit src/openvpn/ssl.c, search for IV_PLAT=linux, and add the following after that line:
```
#elif defined(TARGET_QNXNTO)
      buf_printf (&out, "IV_PLAT=qnx\n");
  
```
Update the source to use IP_RECVDSTADDR instead of IP_PKTINFO, because struct in_pktinfo isn't exactly the same as for other targets. Edit src/openvpn/socket.h, and add the following after the declaration of struct openvpn_sockaddr:
```
#ifdef TARGET_QNXNTO
 #undef HAVE_IN_PKTINFO
 #undef IP_PKTINFO
#endif
  
```
Set up the QNX SDP build environment:
```
source base_directory/qnxsdp-env.sh
  
```
where base_directory is where you installed QNX SDP.

Add the supported targets:

addvariant nto arm le-v7
addvariant nto aarch64 le
addvariant nto x86_64 o

Build the targets:
```
make
  
```

The binaries are located in the specific directory for each target. For example, the openvpn binary is placed in the following:

./nto-arm-le-v7/src/openvpn/openvpn
./nto-x86_64-o/src/openvpn/openvpn
./nto-aarch64-le/src/openvpn/openvpn

Page updated: March 12, 2026