[MacPorts] #71615: graphviz @12.2.1 +gdk_pixbuf+guile+java+ocaml+pangocairo+perl+poppler+python27+rsvg+ruby+smyrna+tcl+x11: error: implicit declaration of function 'readln' is invalid in C99 [-Werror, -Wimplicit-function-declaration]

[MacPorts]

#71615: graphviz @12.2.1
+gdk_pixbuf+guile+java+ocaml+pangocairo+perl+poppler+python27+rsvg+ruby+smyrna+tcl+x11:
error: implicit declaration of function 'readln' is invalid in C99 [-Werror
,-Wimplicit-function-declaration]
-------------------------+----------------------
 Reporter:  cooljeanius  |      Owner:  (none)
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.10.5
 Keywords:               |       Port:  graphviz
-------------------------+----------------------
 Attempting to upgrade graphviz results in the following error for me:
 {{{
 main.c:236:19: error: implicit declaration of function 'readln' is invalid
 in C99 [-Werror,-Wimplicit-function-declaration]
       char *buf = readln(path);
                   ^
 }}}
 So, it's another victim of `-Werror=implicit-function-declaration` being
 on by default now.
 A little further down in the output, it looks like it was in the smyrna
 subdirectory, so I think this might be due to the smyrna variant:
 {{{
 make[3]: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphviz/graphviz/work/graphviz-12.2.1/cmd/smyrna'
 make[2]: *** [all-recursive] Error 1
 make[2]: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphviz/graphviz/work/graphviz-12.2.1/cmd'
 make[1]: *** [all-recursive] Error 1
 make[1]: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphviz/graphviz/work/graphviz-12.2.1'
 make: *** [all] Error 2
 make: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphviz/graphviz/work/graphviz-12.2.1'
 Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphviz/graphviz/work/graphviz-12.2.1"
 && /usr/bin/make -j16 -w all
 Exit code: 2
 Error: Failed to build graphviz: command execution failed
 DEBUG: Error code: CHILDSTATUS 66527 2
 }}}
 Unfortunately, due to the circular dependency described in #55393, I don't
 seem to be able to remove the `+smyrna` variant to verify this. I'm on
 x86_64 Big Sur with Xcode 13.

-- 
Ticket URL: <https://trac.macports.org/ticket/71615>
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