Allow optionally building polkit with duktape instead of mozjs

[ken@…]

This was mentioned in #16807.

The systemd book might move to mozjs-102 when gnome-43 arrives, I leave discussion of that to the editors who use systemd.

Bruce has used '-Djs_engine=mozjs' in polkit-121 which can be changed.

From a reply by 'drfiemost' in blfs-support on 8th August asking if anyone had tried it on LFS (reformatted):

"I've been using it since a while and noticed no problems.

I'm building duktape-2.7.0 with the following recipe (the sed is there to replace -Os with my own CFLAGS, you might want to use -O2):

sed -i 's/-Os' Makefile.sharedlibrary make -f Makefile.sharedlibrary INSTALL_PREFIX=/usr make -f Makefile.sharedlibrary INSTALL_PREFIX=/usr install

Then you can use --with-duktape to build polkit."

looking at the gentoo ebuild for polkit, -Djs_engine=duktape if using duktape

​https://duktape.org/ ​https://github.com/svaarala/duktape/releases

Gentoo has a patch against 2.7.0, duktape-2.7.0-respect-tc-env.patch to remove the trailing -Os, for people who do NOT set CFLAGS I agree that -O2 is the way to go, either by sed or patch+CFLAGS=.

The arch (aur) build of 2.7.0 implies no dependencies other than glibc and gcc.

[Xi Ruoyao]

Why "on sysv"? Both sysv and systemd have GNOME now.

[Tim Tassonis]

Fixed in commit f401faa609

This is my first new blfs page, I hope I've done everything as expected.