I too get this error

make[4]: Entering directory `/graph-tool/build/src/graph/layout'
CXX graph_sfdp.lo
virtual memory exhausted: Cannot allocate memory
make[4]: *** [graph_sfdp.lo] Error 1

Mine is also i5 with 4Gb mem.

Please let me know if any additional information is needed.
Thanks a lot

On Thursday, June 14, 2012 5:59:11 PM UTC+5:30, 任强 wrote:

HI everyone!
I have tried to install graph_tool by compiling source code.But for many times , it reports:
              virtual memory exhausted: Cannot allocate memory
My PC has a 4G main memory and Intel i5 CPU.I thought 4G is enough.

Then I tried to install by apt-get, and came up with a problem.
I have already installed these library before, and versions are right.

graph-tool : Depends: libboost-iostreams1.42.0 (>= 1.42.0-1) but it is not installable
              Depends: libboost-python1.42.0 (>= 1.42.0-1) but it is not installable
              Depends: libboost-regex1.42.0 (>= 1.42.0-1) but it is not installable
              Depends: libcgal5 but it is not installable
              Depends: libpython2.6 (>= 2.6) but it is not installable
              Depends: libboost1.42-dev but it is not installable

Can anyone help me ?
By the way,how to use the public key ?
I have tried "apt-key add signature.asc",but it reports:
gpg: no valid OpenPGP data found.