c - Graph handling library -

i need find library representing , drawing graphs in c (not c++). wish find 1 gpl licence.

i have build dynamically graphs, , draw it. perfect find library has built in drawing functions, without having convert internal graphs graphviz data structure.

i found this one not open source.

i wish ask other recommendations of library.

i think igraph interesting you, i'm sorry didn't used (i use cgraph in qt).

such complex library anyway require substantial effort adapt data structure.