check flags:    
building check-recursive
Making check in src
make[1]: Entering directory `/private/tmp/nix-build-mglppxhng5722rfm544cjji3qyw5ny9m-toolbuslib.drv-0/toolbuslib-1.1/src'
make[1]: Nothing to be done for `check'.
make[1]: Leaving directory `/private/tmp/nix-build-mglppxhng5722rfm544cjji3qyw5ny9m-toolbuslib.drv-0/toolbuslib-1.1/src'
Making check in tifstoc
make[1]: Entering directory `/private/tmp/nix-build-mglppxhng5722rfm544cjji3qyw5ny9m-toolbuslib.drv-0/toolbuslib-1.1/tifstoc'
building check-recursive
Making check in src
make[2]: Entering directory `/private/tmp/nix-build-mglppxhng5722rfm544cjji3qyw5ny9m-toolbuslib.drv-0/toolbuslib-1.1/tifstoc/src'
make[2]: Nothing to be done for `check'.
make[2]: Leaving directory `/private/tmp/nix-build-mglppxhng5722rfm544cjji3qyw5ny9m-toolbuslib.drv-0/toolbuslib-1.1/tifstoc/src'
make[2]: Entering directory `/private/tmp/nix-build-mglppxhng5722rfm544cjji3qyw5ny9m-toolbuslib.drv-0/toolbuslib-1.1/tifstoc'
make[2]: Nothing to be done for `check-am'.
make[2]: Leaving directory `/private/tmp/nix-build-mglppxhng5722rfm544cjji3qyw5ny9m-toolbuslib.drv-0/toolbuslib-1.1/tifstoc'
make[1]: Leaving directory `/private/tmp/nix-build-mglppxhng5722rfm544cjji3qyw5ny9m-toolbuslib.drv-0/toolbuslib-1.1/tifstoc'
make[1]: Entering directory `/private/tmp/nix-build-mglppxhng5722rfm544cjji3qyw5ny9m-toolbuslib.drv-0/toolbuslib-1.1'
make[1]: Nothing to be done for `check-am'.
make[1]: Leaving directory `/private/tmp/nix-build-mglppxhng5722rfm544cjji3qyw5ny9m-toolbuslib.drv-0/toolbuslib-1.1'