check flags:    
building check-recursive
Making check in logging
make[1]: Entering directory `/tmp/nix-build-a3j9ynnsn8ns9j19lkz9c9gsk4vmchk0-c-library.drv-0/c-library-1.2/logging'
make[1]: Nothing to be done for `check'.
make[1]: Leaving directory `/tmp/nix-build-a3j9ynnsn8ns9j19lkz9c9gsk4vmchk0-c-library.drv-0/c-library-1.2/logging'
Making check in statistics
make[1]: Entering directory `/tmp/nix-build-a3j9ynnsn8ns9j19lkz9c9gsk4vmchk0-c-library.drv-0/c-library-1.2/statistics'
make[1]: Nothing to be done for `check'.
make[1]: Leaving directory `/tmp/nix-build-a3j9ynnsn8ns9j19lkz9c9gsk4vmchk0-c-library.drv-0/c-library-1.2/statistics'
make[1]: Entering directory `/tmp/nix-build-a3j9ynnsn8ns9j19lkz9c9gsk4vmchk0-c-library.drv-0/c-library-1.2'
make[1]: Nothing to be done for `check-am'.
make[1]: Leaving directory `/tmp/nix-build-a3j9ynnsn8ns9j19lkz9c9gsk4vmchk0-c-library.drv-0/c-library-1.2'