indexinfo: Impossible to write the index file: Capabilities insufficient

[Jinsong Zhao]

Hi there,

After installation or upgradation of tex-kpathsea, I got lots warning 
such as:

indexinfo: Skipping: asy-faq.info: Capabilities insufficient
...
indexinfo: Skipping: web2c.info: Capabilities insufficient
indexinfo: Impossible to write the index file: Capabilities insufficient

And those warnings repeated several times.

I don't install any component of TeX/LaTeX distribution except for 
tex-kpathsea package. I have updated to the latest version of FreeBSD 
and pkg.

What's the problem? and how to avoid those warnings.

Best,
Jinsong

P.S.:
root at xw6600:/root # pkg -v
1.10.5
root at xw6600:/root # freebsd-version
11.2-RELEASE-p4