Hello,

I started a patch to add guile-fibers, which I know many of us are
intertested in giving a spin, but I haven't gotten things to build
right.  The funny thing is I can get it to build fine from the tarball
itself.  I'm missing something in the package, but I don't know what.

Here's the error I get during "make":

  Backtrace:
  In ice-9/boot-9.scm:
    2788:17 19 (resolve-interface (fibers internal) #:select _ #:hide _ …)
    2713:10 18 (_ (fibers internal) _ _ #:ensure _)
    2989:16 17 (try-module-autoload _ _)
     2325:4 16 (save-module-excursion #<procedure cf79f0 at ice-9/boot…>)
    3009:22 15 (_)
  In unknown file:
            14 (primitive-load-path "fibers/internal" #<procedure c2d0…>)
  In ice-9/eval.scm:
     710:20 13 (primitive-eval (define-module (fibers internal) # (…) …))
  In ice-9/psyntax.scm:
    1209:36 12 (expand-top-sequence ((define-module (fibers #) # # …)) …)
    1156:24 11 (parse _ (("placeholder" placeholder)) ((top) #(# # …)) …)
     279:10 10 (parse _ (("placeholder" placeholder)) (()) _ c&e (eval) …)
  In ice-9/eval.scm:
     293:34  9 (_ #<module (#{ g1042}#) a45480>)
  In ice-9/boot-9.scm:
    2849:10  8 (define-module* _ #:filename _ #:pure _ #:version _ # _ …)
    2788:17  7 (resolve-interface (fibers epoll) #:select _ #:hide _ # …)
    2713:10  6 (_ (fibers epoll) _ _ #:ensure _)
    2989:16  5 (try-module-autoload _ _)
     2325:4  4 (save-module-excursion #<procedure d2ad80 at ice-9/boot…>)
    3009:22  3 (_)
  In unknown file:
             2 (primitive-load-path "fibers/epoll" #<procedure c96fa0 …>)
             1 (load-extension "epoll" "init_fibers_epoll")
  In ice-9/boot-9.scm:
     753:26  0 (dispatch-exception _ _ _)
  
  ice-9/boot-9.scm:753:26: In procedure dispatch-exception:
  ice-9/boot-9.scm:753:26: In procedure dynamic-link: file: "epoll", message: "file not found"
  make[1]: *** [Makefile:1381: fibers/channels.go] Error 1
  make[1]: Leaving directory '/tmp/guix-build-guile-fibers-0.3.0.drv-0/fibers-0.3.0'
make: *** [Makefile:498: all] Error 2
  phase `build' failed after 3.4 seconds

Funny thing is, if I become the builder user and then try running
./configure && make after sourcing the environment variables, things
build fine.

One of the two must be true, afaict:
 - ... either there's something in the system environment that's being
   included that I'm missing
 - ... or Guix is patching the gnu-build-system stuff in such a way
   that things are different than when I run ./configure && make?

I'd really like this package to work but am not sure I have the time to
continue on it soon.  If someone wants to take over from here, go for
it.  Maybe what I'm missing is something obvious...

 - Chris