check flags:    
building check-recursive
Making check in lib
make[1]: Entering directory `/tmp/nix-30004-3/graph-support-1.0.1/lib'
make[1]: Nothing to be done for `check'.
make[1]: Leaving directory `/tmp/nix-30004-3/graph-support-1.0.1/lib'
Making check in utils
building check-recursive
make[1]: Entering directory `/tmp/nix-30004-3/graph-support-1.0.1/utils'
Making check in tree2graph
make[2]: Entering directory `/tmp/nix-30004-3/graph-support-1.0.1/utils/tree2graph'
make[2]: Nothing to be done for `check'.
make[2]: Leaving directory `/tmp/nix-30004-3/graph-support-1.0.1/utils/tree2graph'
Making check in layoutgraph
make[2]: Entering directory `/tmp/nix-30004-3/graph-support-1.0.1/utils/layoutgraph'
make[2]: Nothing to be done for `check'.
make[2]: Leaving directory `/tmp/nix-30004-3/graph-support-1.0.1/utils/layoutgraph'
make[2]: Entering directory `/tmp/nix-30004-3/graph-support-1.0.1/utils'
make[2]: Nothing to be done for `check-am'.
make[2]: Leaving directory `/tmp/nix-30004-3/graph-support-1.0.1/utils'
make[1]: Leaving directory `/tmp/nix-30004-3/graph-support-1.0.1/utils'
make[1]: Entering directory `/tmp/nix-30004-3/graph-support-1.0.1'
make[1]: Nothing to be done for `check-am'.
make[1]: Leaving directory `/tmp/nix-30004-3/graph-support-1.0.1'