gegl-0.1.2 test failures on IRIX/MIPSpro

After building successfully gegl's test-suite fails with the following
output when built on MIPS/IRIX with the platform MIPSpro compilers
(latest release: 7.4.4m):

Making check in gegl
Making check in buffer
make[2]: Nothing to be done for `check'.
Making check in graph
make[2]: Nothing to be done for `check'.
Making check in module
make[2]: Nothing to be done for `check'.
Making check in operation
make[2]: Nothing to be done for `check'.
Making check in process
make[2]: Nothing to be done for `check'.
Making check in property-types
make[2]: Nothing to be done for `check'.
make[2]: Nothing to be done for `check-am'.
Making check in operations
Making check in affine
make[2]: Nothing to be done for `check'.
Making check in core
make check-local
make[3]: Nothing to be done for `check-local'.
Making check in common
Making check in perlin
make[3]: Nothing to be done for `check'.
make check-local
make[4]: Nothing to be done for `check-local'.
Making check in generated
make check-local
make[3]: Nothing to be done for `check-local'.
Making check in external
make[2]: Nothing to be done for `check'.
make[2]: Nothing to be done for `check-am'.
Making check in bin
make[1]: Nothing to be done for `check'.
Making check in tools
make[1]: Nothing to be done for `check'.
Making check in examples
Making check in data
make[2]: Nothing to be done for `check'.
make[2]: Nothing to be done for `check-am'.
Making check in tests
Making check in buffer
make check-am
make buffer-test
make[4]: `buffer-test' is up to date.
make check-TESTS
36 of 36 tests succesful.
PASS: buffer-tests-results.sh
=============
1 test passed
=============
Making check in compositions
Making check in data
make[3]: Nothing to be done for `check'.
make check-TESTS
make[4]: Entering directory `gegl-0.1.2/tests/compositions'

Failed to open ./reference/clones.png
Failed to open ./reference/downsharptest.png
Failed to open ./reference/downsizetest.png
Failed to open ./reference/downsmoothtest.png
Failed to open ./reference/reflect2.png
Failed to open ./reference/reflect.png
Failed to open ./reference/rotate.png
Failed to open ./reference/simple-scale.png
Failed to open ./reference/upsharptest.png
Failed to open ./reference/upsizetest.png
Failed to open ./reference/upsmoothtest.png
-------------------------
0 of 11 tests succesful.
FAIL: verify-results.sh
==================
1 of 1 test failed
==================
make[4]: *** [check-TESTS] Error 1
make[4]: Leaving directory `gegl-0.1.2/tests/compositions'
make[3]: *** [check-am] Error 2
make[2]: *** [check-recursive] Error 1
make[1]: *** [check-recursive] Error 1
make: *** [check-recursive] Error 1


Instructing make to continue after errors have occurred results in the
following additional output:


make check-TESTS
make[3]: Entering directory `gegl-0.1.2/tests'

** (test-change-processor-rect:31370014): WARNING **: Failed to set
operation type gegl:text, using a passthrough op instead

** (test-change-processor-rect:31370014): WARNING **: Failed to set
operation type gegl:text, using a passthrough op instead
PASS: test-change-processor-rect
PASS: test-proxynop-processing
PASS: test-color-op
PASS: test-gegl-rectangle
==================
All 4 tests passed
==================


I don't know whether the 'passthrough' warning is significant or not
(although it doesn't sound good), or why the opening of the above files
(which do exist and have reasonable permissions) is failing.

Note that this gegl is built against the most-likely-broken babl I sent
an email about earlier, which complains about non-symmetric transforms.

Cheers,

Stuart