I've been a guile user erratically for a long time, and maintain the entry for guile in pkgsrc. Currently that's at 1.8.8 and it works fine. There's a draft package for guile 2. boehm-gc in pkgsrc on NetBSD is built without threads, and I have --disable-threads passed to guile's configure. The build goes ok until trying to run guild. Just starting it without args leads to: /usr/pkgsrc/wip/guile2/work/guile-2.0.10/libguile > ../meta/uninstalled-env ../meta/guild 0xbbbe12d4 is not a GC visible pointer location GC_is_visible test failed Abort trap (core dumped) Trying with gdb: Starting program: /u0/n0/gdt/NetBSD-current/pkgsrc/wip/guile2/work/guile-2.0.10/libguile/.libs/guile Program received signal SIGSEGV, Segmentation fault. [Switching to LWP 1] 0xbba868ae in GC_find_limit_with_bound () from /usr/pkg/lib/libgc.so.1 (gdb) bt #0 0xbba868ae in GC_find_limit_with_bound () from /usr/pkg/lib/libgc.so.1 #1 0xbba8696e in GC_find_limit () from /usr/pkg/lib/libgc.so.1 #2 0xbba8699d in GC_init_netbsd_elf () from /usr/pkg/lib/libgc.so.1 #3 0xbba85b3f in GC_init () from /usr/pkg/lib/libgc.so.1 #4 0xbbaf9748 in scm_storage_prehistory () from .libs/libguile-2.0.so.29 #5 0xbbb0abaf in scm_i_init_guile () from .libs/libguile-2.0.so.29 #6 0xbbb670bc in scm_i_init_thread_for_guile () from .libs/libguile-2.0.so.29 #7 0xbbb672d7 in with_guile_and_parent () from .libs/libguile-2.0.so.29 #8 0xbba85767 in GC_call_with_stack_base () from /usr/pkg/lib/libgc.so.1 #9 0xbbb674b9 in scm_with_guile () from .libs/libguile-2.0.so.29 #10 0xbbb0ab67 in scm_boot_guile () from .libs/libguile-2.0.so.29 #11 0x08048ce9 in main () When I run the included tests on boehm-gc 7.2e, they all past. So I wonder if you think this is a boehm-gc issue, or something odd that guile is doing to boehm-gc. Any hints would be appreciated.