That fixed tcsh, thanks. Here is the next stop - glib (libgio), seems to be failing its unit tests:
....
PASS: defaultvalue 80 /Default Values/GZlibCompressor
PASS: defaultvalue 81 /Default Values/GZlibDecompressor
tap-driver.sh: internal error getting exit status
tap-driver.sh: fatal: I/O or internal error
Makefile:3751: recipe for target 'defaultvalue.log' failed
make[8]: *** [defaultvalue.log] Error 1
make[8]: Leaving directory '/tmp/nix-build-glib-2.44.0.drv-0/glib-2.44.0/gio/tests'
Makefile:3653: recipe for target 'check-TESTS' failed
make[7]: *** [check-TESTS] Error 2
make[7]: Leaving directory '/tmp/nix-build-glib-2.44.0.drv-0/glib-2.44.0/gio/tests'
Makefile:4353: recipe for target 'check-am' failed
make[6]: *** [check-am] Error 2
make[6]: Leaving directory '/tmp/nix-build-glib-2.44.0.drv-0/glib-2.44.0/gio/tests'
Makefile:3440: recipe for target 'check-recursive' failed
make[5]: *** [check-recursive] Error 1
make[5]: Leaving directory '/tmp/nix-build-glib-2.44.0.drv-0/glib-2.44.0/gio/tests'