Bugzilla Bug 175371

The linking of the final stklos executable fails with:
dynload.o: In function `STk_load_object_file':
dynload.c:(.text+0x74): undefined reference to `GC_dlopen'
dynload.c:(.text+0x123): undefined reference to `GC_dlopen'
thread-pthreads.o: In function `STk_sys_thread_start':
thread-pthreads.c:(.text+0x295): undefined reference to `GC_pthread_create'

I'm guessing this is actually a problem with the configure script autodetection
more than the actual presence of a system boehmgc library.  Forcing the
configure script to use its included gc (--with-provided-gc) lets it link
normally (and works fine).

Reproducible: Always

Steps to Reproduce:
1. Install boehm-gc (or have it installed already)
2. Try to install stklos
3. Fail
4. Uninstall boehm-gc
5. Install stklos
6. Succeed

One more note - if you re-install boehm-gc as normal after installing 
stklos, the stklos executable picks it up via dynamic linking and it
works just fine.

it works fine here, with dev-libs/boehm-gc-6.8 installed (-nocxx threads)

SUMMARY
*******
            System:  Linux-2.6.20-gentoo
           OS type:  unix
   Install prefix :  /usr
        C compiler:  x86_64-pc-linux-gnu-gcc
 Compilation flags:  -O2 -pipe -ggdb
    Bignum library:  use the system library
    Regexp library:  use the system library
        GC library:  use the system library
      LDAP support:  no
      GTK+ support:  yes
     GNOME support:  no
    Thread support:  pthreads

I should have paid some more attention to use flags though and added boehm-gc
as a dependency.

Please provide the build log and emerge --info.

It seems that stklos requires dev-libs/boehm-gc to be compiled
with the threads use flag (oops).