FAQ¶

Q:
I followed the installation instructions but when I do
>>> import pygraphviz
I get an error like ImportError: libagraph.so.1: cannot open shared object file: No such file or directory

What is wrong?
A:
Some Unix systems don’t include the Graphviz library in the default search path for the run-time linker. The path is often something like /usr/lib/graphviz or /sw/lib/graphviz etc. and it needs to be added to your search path. You can

set the LD_LIBRARY_PATH environment variable e.g. export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/lib/graphviz

configure your system with the additional path. e.g. for Linux add a line to /etc/ld.so.conf and run ldconfig

Q:
How do I compile pygraphviz under Windows? And why don’t you distribute a pygraphviz Windows installer?

A:
We don’t have Windows development machines but would like to have pygraphviz work on all platforms. If you have success with Windows or would be willing to help test and distribute a Windows installer please drop us a note.

See also tickets: https://networkx.lanl.gov/trac/ticket/117

https://networkx.lanl.gov/trac/ticket/491

Q:	I followed the installation instructions but when I do >>> import pygraphviz I get an error like ImportError: libagraph.so.1: cannot open shared object file: No such file or directory What is wrong?
A:	Some Unix systems don’t include the Graphviz library in the default search path for the run-time linker. The path is often something like /usr/lib/graphviz or /sw/lib/graphviz etc. and it needs to be added to your search path. You can set the LD_LIBRARY_PATH environment variable e.g. export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/lib/graphviz configure your system with the additional path. e.g. for Linux add a line to /etc/ld.so.conf and run ldconfig
Q:	How do I compile pygraphviz under Windows? And why don’t you distribute a pygraphviz Windows installer?
A:	We don’t have Windows development machines but would like to have pygraphviz work on all platforms. If you have success with Windows or would be willing to help test and distribute a Windows installer please drop us a note. See also tickets: https://networkx.lanl.gov/trac/ticket/117 https://networkx.lanl.gov/trac/ticket/491