Python 3.x fails build on Solaris 10

[John H <jsh%SDF.ORG@localhost>]

Hi Everyone

Setting up pkgsrc-2021Q1 on Solaris 10 x86 for an experiment. Going quite well so far, but still using an old gcc version (3.4.3) to build a newer one within the pkgsrc ecosystem, however, seems I need Python 
first. whenever I attempt to build any version of python 3.x I am dropped out with this:

ld: fatal: library -lcrypt: not found

...which leads to 

ERROR: The following files are in the PLIST but not in /usr/pkgsrc/lang/python39/work/.destdir/usr/pkg:
ERROR:         /usr/pkgsrc/lang/python39/work/.destdir/usr/pkg/lib/python3.9/lib-dynload/_crypt.so

Hoping there's something simple I need to install first like a crypt library, any ideas appreciated!

John

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