Port cannot install gnuplot

[matthew20103@…]

When I was trying to install the gnuplot via macports, i.e.

sudo port clean gnuplot
sudo port install gnuplot

I got the following messages:

Error: org.macports.build for port gnuplot returned: command execution failed
Please see the log file for port gnuplot for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_math_gnuplot/gnuplot/main.log
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets
Error: Processing of port gnuplot failed

After inspecting the main.log file, I found the following error message:

:info:build dyld: Library not loaded: /opt/local/lib/libpng15.15.dylib
:info:build   Referenced from: /opt/local/lib/libpangocairo-1.0.0.dylib
:info:build   Reason: Incompatible library version: libpangocairo-1.0.0.dylib requires version 31.0.0 or later, but libpng15.15.dylib provides version 30.0.0

How can I solve this problem?

[matthew20103@…]

Here attached the main.log file, please have a look.

[matthew20103@…]

Cc Me!

[neverpanic (Clemens Lang)]

Please remember to set the port field and cc the maintainer. You don't need to cc yourself. Please try to use WikiFormatting when posting in trac.

Please provide the output of otool -L /opt/local/lib/libpng15.15.dylib on your system.