Nut upsdev - Sep 2021 - Cross-compiling for OpenWRT on Debian - neon libraries error

Hi all,

Bit of a noob question I'm sure but would appreciate the help.  The nut
package maintained for OpenWRT does not include the netxml drivers that I
need for my UPS, so I'm embarking on something a little outside my comfort
zone and trying to cross-compile from source.  The build system is Debian.

I've got quite far, and was able to cross-compile nut with default options
but adding the --with-neon is breaking it.  I've installed the neon dev
libraries on the build system and they seem to be detected during the
configure stage
...
checking for libneon version via pkg-config (0.25.0 minimum required)...
0.30.2 found
checking for libneon cflags... -I/usr/include/neon
checking for libneon ldflags... -lneon
...
but then it quits with an error.
configure: error: "neon libraries not found, required for neon based
XML/HTTP driver"

I've verified the neon header files are in /usr/include/neon beyond that,
I'm at a loss.  Any help would be appreciated.  Thanks.

Seb
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On Sep 16, 2021, at 6:30 AM, Seb Belcher via Nut-upsdev <nut-upsdev at
alioth-lists.debian.net> wrote:
> 
> Bit of a noob question I'm sure but would appreciate the help.  The nut
package maintained for OpenWRT does not include the netxml drivers that I need
for my UPS, so I'm embarking on something a little outside my comfort zone
and trying to cross-compile from source.  The build system is Debian.
> 
> I've got quite far, and was able to cross-compile nut with default
options but adding the --with-neon is breaking it.  I've installed the neon
dev libraries on the build system and they seem to be detected during the
configure stage
> ...
> checking for libneon version via pkg-config (0.25.0 minimum required)...
0.30.2 found
> checking for libneon cflags... -I/usr/include/neon
> checking for libneon ldflags... -lneon
> ...
> but then it quits with an error. 
> configure: error: "neon libraries not found, required for neon based
XML/HTTP driver"
> 
> I've verified the neon header files are in /usr/include/neon beyond
that, I'm at a loss.  Any help would be appreciated.  Thanks.
> 
It's been a little while since I last used a cross-compiler, so maybe I am
rusty on terminology. It sounds like you are building on a Debian system, but
targeting OpenWRT - are they both the same architecture? (e.g. Debian on MIPS,
and a WRT54G MIPS-based router)

If not, I would expect that your path for libneon would be a little longer, with
the target architecture/OS included in there somewhere. (The include files might
work across similar architectures, but the libraries are definitely going to
have to match the target architecture/OS.)

For instance, you might need to install libneon into the Buildroot staging_dir
if you are following these instructions:

https://openwrt.org/docs/guide-developer/crosscompile

then follow their recommendations on setting LDFLAGS (which should probably show
up in NUT's ./configure output).