[MacPorts] #37847: graphviz fails to build with ming + fix

[MacPorts]

#37847: graphviz fails to build with ming + fix
---------------------+--------------------------------
 Reporter:  david@…  |      Owner:  macports-tickets@…
     Type:  defect   |     Status:  new
 Priority:  High     |  Milestone:
Component:  ports    |    Version:  2.1.2
 Keywords:           |       Port:  graphviz
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 graphviz fails when build is unable to find the cgraph.h file.

 Problem is fixed by adding -I/opt/local/include/graphviz for include file
 searching.

 cd
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_graphviz/graphviz/work/graphviz-2.30.0/plugin/ming

 /usr/bin/clang -DHAVE_CONFIG_H -I. -I../.. -I../../lib/common -I../..
 -I../../lib/common -I../../lib/pathplan -I../../lib/gvc -I../../lib/graph
 -I../../lib/cdt -I/opt/local/include/graphviz -I/opt/local/include
 -I/opt/local/include -I/opt/local/include -pipe -O2 -arch x86_64 -fno-
 common -Wall -MT gvrender_ming.lo -MD -MP -MF .deps/gvrender_ming.Tpo -c
 gvrender_ming.c  -fno-common -DPIC -o .libs/gvrender_ming.o

 Attached is build log.

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Ticket URL: <https://trac.macports.org/ticket/37847>
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