check-tag test fails with modules

I'm encountering a difficult issue seemingly involving "modules". The test suite fails as follows:

/opt/local/bin/bmake  check-TESTS
PASS: check-extlang
PASS: check-grandfathered
PASS: check-lang
PASS: check-list
PASS: check-region
PASS: check-script
FAIL: check-tag
PASS: check-trie
PASS: check-variant
============================================================================
Testsuite summary for liblangtag 0.5.4
============================================================================
# TOTAL: 9
# PASS:  8
# SKIP:  0
# XFAIL: 0
# FAIL:  1
# XPASS: 0
# ERROR: 0
============================================================================
See tests/test-suite.log
Please report to http://github.com/tagoh/liblangtag/issues

and

============================================
   liblangtag 0.5.4: tests/test-suite.log
============================================

# TOTAL: 9
# PASS:  8
# SKIP:  0
# XFAIL: 0
# FAIL:  1
# XPASS: 0
# ERROR: 0

.. contents:: :depth: 2

FAIL: check-tag
===============

Running suite(s): lt_tag_t
0%: Checks: 7, Failures: 0, Errors: 7
(null):-1:S:Basic functionality:test_lt_tag_parse:0: (after this point) Received signal 11 (Segmentation Fault)
(null):-1:S:Basic functionality:test_lt_tag_parse_with_extra_token:0: (after this point) Received signal 11 (Segmentation Fault)
(null):-1:S:Basic functionality:test_lt_tag_canonicalize:0: (after this point) Received signal 11 (Segmentation Fault)
(null):-1:S:Basic functionality:test_lt_tag_canonicalize_in_extlang_form:0: (after this point) Received signal 11 (Segmentation Fault)
(null):-1:S:Basic functionality:test_lt_tag_match:0: (after this point) Received signal 11 (Segmentation Fault)
(null):-1:S:Basic functionality:test_lt_tag_transform:0: (after this point) Received signal 11 (Segmentation Fault)
(null):-1:S:Basic functionality:test_lt_tag_convert_from_locale_string:0: (after this point) Received signal 11 (Segmentation Fault)

adding CFLAGS+= -g and configuring with '--enable-debug' I'm able to reproduce the issue with a trivial test program

#include <stdlib.h>
#include <unistd.h>
#include <liblangtag/langtag.h>
int
main(int argc, char **argv)
{
    lt_db_initialize();
    lt_db_finalize();
}

which, built with debug gives interestingly:

#!
richard@omnis:/home/richard/src/tlt$ ./check-tag
I: /tmp/pkgsrc/devel/liblangtag/work/liblangtag-0.5.4/data/common/supplemental/likelySubtags.xml
W: Duplicate extension module: ldml-u
W: Duplicate extension module: ldml-t
Segmentation Fault (core dumped)

The segfault is more or less always involving:

open("/opt/local/lib/liblangtag", O_RDONLY|O_NDELAY|O_LARGEFILE) = 3
fcntl(3, F_SETFD, 0x00000001)           = 0
fstat64(3, 0x080479C0)              = 0
getdents64(3, 0xFE954000, 8192)         = 336
getuid()                    = 101 [101]
getuid()                    = 101 [101]
getgid()                    = 10 [10]
getgid()                    = 10 [10]
stat64("/tmp/pkgsrc/devel/liblangtag/work/liblangtag-0.5.4/extensions/liblangtag-ext-ldml-u.so", 0x08047190) Err#2 ENOENT
write(2, " W :  ", 3)               = 3
write(2, " D u p l i c a t e   e x".., 34)  = 34
write(2, "\n", 1)               = 1
getuid()                    = 101 [101]
getuid()                    = 101 [101]
getgid()                    = 10 [10]
getgid()                    = 10 [10]
stat64("/tmp/pkgsrc/devel/liblangtag/work/liblangtag-0.5.4/extensions/liblangtag-ext-ldml-t.so", 0x08047190) Err#2 ENOENT
write(2, " W :  ", 3)               = 3
write(2, " D u p l i c a t e   e x".., 34)  = 34
write(2, "\n", 1)               = 1
getdents64(3, 0xFE954000, 8192)         = 0
close(3)                    = 0
    Incurred fault #6, FLTBOUNDS  %pc = 0x646C0076
      siginfo: SIGSEGV SEGV_MAPERR addr=0x646C0076
    Received signal #11, SIGSEGV [default]
      siginfo: SIGSEGV SEGV_MAPERR addr=0x646C0076

the address strangely resembles the ASCII string "dl\0v"

(BTW, it's probably a bug that the build directory is maintained in liblangtag.so, as verified with strings)

If I configure with '--disable-modules' the testsuite passes and my program (and libreoffice) seem to work okay.

This is i386 pkgsrc running on SunOS 5.11 (illumos).

Is there anything particularly special about these "modules", if so, any hints on how to get over this?

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