FRR cannot find libraries installed to non-standard locations

[tsmjay]

Hi,

I'm compiling FRR from source on Arch.

FRR has a dependency on libyang.

If I compile libyang in the default location (/usr/local), when I go to compile FRR, I get the following error:

checking for LIBYANG (libyang >= 2.1.128)... no
configure: error: libyang >= 2.1.128 is required, and was not found on your system. Please consult doc/developer/building-libyang.rst for instructions on installing or building libyang.

The libyang library is located in /usr/local/lib.

If I compile libyang in a custom location (/usr), then FRR compiles without problems.

In this case, the libyang library is located in /usr/lib.

Adding /usr/local/lib to /etc/ld.so.conf and running ldconfig doesn't have any effect.

Is this a bug?

Thanks.

Software versions:
FRR 10.2.2
libyang 2.1.148
Arch 2023/12/05

[mjstapp]

the configure script uses pkg-config to locate libyang, I think - you can check that out directly. If the pkg-config metadata is present, and pointing to the correct place, I think the configure script will succeed.