[maarten-boot]

Every platform's descr maps -l<name> to
{PLATFORMDIR}/lib<name>, without .a, so the linker can't open it:

$ ack -mpc86 -o m m.c -lm
em_led: can't read .../share/ack/pc86/libm (fatal)

-lc fails the same way, on all 14 platforms with a C library. minix68k
still maps it to the old Minix-ST lib/minixST/tail_<name>. This maps
-l<name> to lib<name>.a, and -lm to libc.a, which holds the
maths functions (no platform builds a libm), so makefiles that pass
-lm work.

em22 gets no -lm: libc.a is always linked there, and em_ass can't
take a library twice ("global symbol '__ctype' redefined").

Tested: all platforms, 226 tests pass. -lm and -lc link on the 13
platforms that use em_led; a missing library is now named correctly
(can't read .../libnosuch.a). On pc86 and linuxppc the program
linked with -lm is identical to the one linked without it.

🤖 Generated with Claude Code

[davidgiven]

Goes to show how little people actually use libraries on this. Merging, thanks.