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OpenBSD's default perl Config.pm includes -Bforcearchive in the link
flags for loadable extensions.
The way Tk build is supposed to work is that all the converted Tcl/Tk
.c files get compiled in pTk subdirectory and put in the archive library
libpTk.a . Then each of Tk widgets and sub-systems links their own
.o files and libpTk.a - with the intent of only picking the bits from
libpTk.a they need. But -Bforcearchive tells linker to include ALL
of the .o files in the .a file - which not only leads to huge loadables
full of unused code, but also gives multiple definitions
of symbols in Tk::Event which expects to be able to override some
of the generic routines.
So Tk/MMutil.pm attempts to remove the option from LDDLFLAGS when
perl's $^O eq 'openbsd'.
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