[cairo] Re: PKG_CONFIG undefined during checking for 'cairo's PNG backend', whilst 'checking for pkg-config' looks good.

[Jinghua Luo]

Leon Woestenberg wrote:
> Hello all,
> 
> I am bringing cairo 1.2.6 as an OpenEmbedded package build, but I run
> into an undefined PKG_CONFIG variable during configure testing the
> availability of png libraries using "--exists", while configure *did*
> find the full pkg-config.
> 
> I am lost as where the PKG_CONFIG is set or cleared, can someone look
> along please?
> 
> The two dashes are from an echo "-- $PKG_CONFIG" I introduced.
> 
> ---<snippet one>---
> ...
> checking for armeb-linux-pkg-config... no
> checking for pkg-config...
> /home/leon/sandbox/ixp4xx/openembedded/build/tmp/staging/x86_64-linux/bin/pkg-config 
> 
> checking pkg-config is at least version 0.19... no
your pkg-config is too old ;)