pkg-config not used in configure?

[Paul Smith]

On Mon, 2024-09-09 at 15:29 -0400, Paul Smith wrote:
> I'm trying to build the latest elfutils release 0.191.  The configure
> help says:
> 
>   ZSTD_COMPRESS_CFLAGS
>               C compiler flags for ZSTD_COMPRESS, overriding pkg-
> config
>   ZSTD_COMPRESS_LIBS
>               linker flags for ZSTD_COMPRESS, overriding pkg-config

Actually, these variables don't seem to work either.

Looking at the generated configure script, I don't see how to get
elfutils to use zstd from a non-standard location?

Do we just have to set the default CFLAGS / LDFLAGS...?