[Slackbuilds-users] Building gnumeric-1.2.49 fails to find python3.7

[Rich Shepard]

Here python3.7 is found in ~/.local/lib/site-packages/, /usr/bin/python3.7m,
/usr/bin/python3.7m-config, usr/bin/python3.7-config, usr/bin/python3.7, and
virtua environments in /usr/lib64/.

Trying to build gnumeric (and goffice is installed) fails:
   CCLD     python_loader.la
/usr/lib64/gcc/x86_64-slackware-linux/5.5.0/../../../../x86_64-slackware-linux/bin/ld: cannot find -lpython3.7
collect2: error: ld returned 1 exit status
Makefile:557: recipe for target 'python_loader.la' failed
make[3]: *** [python_loader.la] Error 1
make[3]: Leaving directory '/tmp/SBo/gnumeric-1.12.49/plugins/python-loader'
Makefile:504: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/tmp/SBo/gnumeric-1.12.49/plugins'
Makefile:662: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/tmp/SBo/gnumeric-1.12.49'
Makefile:521: recipe for target 'all' failed
make: *** [all] Error 2

I don't find an error or log file in /tmp/SBo/gnumeric-1.12.49.

Where do I look for the reason for this error?

TIA,

Rich