[MacPorts] #40171: Port cannot install gnuplot

[MacPorts]

#40171: Port cannot install gnuplot
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 Reporter:  matthew20103@…  |      Owner:  macports-tickets@…
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.2.0
 Keywords:                  |       Port:
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 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?

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Ticket URL: <https://trac.macports.org/ticket/40171>
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