> are we really adding dependencies while we are 'frozen'???
  >
  > checking for BDW_GC... configure: error: Package requirements (bdw-gc)
  > were not met:

  Sorry if we did not communicate clearly; the plan was definitely to
  merge in bdw-gc before the release, and possibly during the freeze
  period.

Probably you did.  I am just barely able to pay attention, and likely
forgot - while I see the point this kind of change in freeze is unusual.

I installed pkgsrc/devel/boehm-gc and then:


gmake[3]: Entering directory `/home/gdt/BUILD-GUILE-master/guile/libguile'
/bin/ksh ../libtool --tag=CC   --mode=link gcc -I/usr/pkg/include -I/usr/y0/include -pthread -Wall -Wmissing-prototypes -Werror -fvisibility=hidden -I/usr/pkg
include   -g -O2 -I/usr/pkg/include -I/usr/y0/include -pthread -L/usr/pkg/lib -R/usr/pkg/lib -L/usr/y0/lib -R/usr/y0/lib -Wl,-z -Wl,relro -o guile guile-guile
o libguile.la -L/usr/pkg/lib -lgc   -L/usr/y0/lib -lunistring -R/usr/y0/lib -lcrypt -lm -lltdl 
gcc -I/usr/pkg/include -I/usr/y0/include -pthread -Wall -Wmissing-prototypes -Werror -fvisibility=hidden -I/usr/pkg/include -g -O2 -I/usr/pkg/include -I/usr/y
/include -pthread -Wl,-z -Wl,relro -o .libs/guile guile-guile.o  -L/usr/pkg/lib -L/usr/y0/lib ./.libs/libguile.so /usr/pkg/lib/libintl.so -lc /usr/pkg/lib/lib
mp.so /usr/pkg/lib/libgc.so /usr/y0/lib/libunistring.so -lcrypt -lm /usr/pkg/lib/libltdl.so  -Wl,--rpath -Wl,/usr/local/lib -Wl,--rpath -Wl,/usr/pkg/lib -Wl,-
rpath -Wl,/usr/y0/lib
./.libs/libguile.so: warning: warning: tmpnam() possibly used unsafely, use mkstemp() or mkdtemp()
./.libs/libguile.so: undefined reference to `GC_pthread_detach'
./.libs/libguile.so: undefined reference to `GC_pthread_create'
./.libs/libguile.so: undefined reference to `GC_pthread_sigmask'
gmake[3]: *** [guile] Error 1



Perhaps boehm-gc can be built with thread support?  The guile README
doesn't seem to say anything about this.  pkgsrc does have the ability
to configure with thread support, but by default doesn't.  I don't know
why - but usually there are programs that want it and programs that
can't have it, leading to trouble.  I will inquire.