Hello Peebee,
I took a look at both 32bit and 64bit ScPup 19.01+4
Loaded devx and kernel_headers to test compiling of NetSurf browser.
Package gperf is required, it is only a small single executable so it may be worth considering adding it to the devx.
As with the slackos, there is the perl-html-parser package (perl modules) which is needed and missing. Installing this via PPM produces an error when compiling NetSurf which complains that the perl binaries and libraries are mismatched. Not sure why this should happen if the packages are all Slackware Current.
I grabbed the source package of the same number (3.71) from Debian Jessie repos and compiled that in ScPup and then everything is matched up correctly. Package to search for in Debian is named libhtml-parser-perl instead of perl-html-parser in Slackware. Anyway, with this, NetSurf compiles and runs OK. I have uploaded the 32bit and 64bit packages in case anyone wants to test them.
http://smokey01.com/OscarTalks
The one from Alt Linux which you repackaged is also fine, but has the copy of the main executable /usr/bin/netsurf-gtk which is surplus to requirements because /usr/lib/netsurf/nsgtk is a copy of the same file and that is the one which gets called in all cases as far as I can see. If you want to be able to call it as netsurf-gtk I suppose you could add a symlink.
Looking good though, thanks for all the hard work and dedication.