[Bug 248859] x11-wm/piewm: [MAINTAINER] circumvent "ld: error: duplicate symbol: yylineno"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248859

            Bug ID: 248859
           Summary: x11-wm/piewm: [MAINTAINER] circumvent "ld: error:
                    duplicate symbol: yylineno"
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: david at catwhisker.org
                CC: dhw at FreeBSD.org

Created attachment 217466
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=217466&action=edit
Patch to x11-wm/piewm/Makefile to add the "-fcommon" flag.

pkg-fallout at FreeBSD.org informs me that x11-wm/piewm is now failing to link
under recent FreeEBSD head with the whine:

...

--- piewm ---
rm -f piewm
cc -o piewm       -L/usr/local/lib   gram.o lex.o deftwmrc.o add_window.o gc.o
list.o twm.o             parse.o menus.o events.o resize.o util.o version.o
iconmgr.o            cursor.o icons.o vdt.o move.o LocPixmap.o -lXmu -lXt -lSM
-lICE -lXext -lX11 -lXt -lSM -lICE -lXext -lXext -lX11 -lm -ll -lXpm     
-Wl,-rpath,/usr/local/lib
ld: error: duplicate symbol: yylineno
>>> defined at gram.c
>>>            gram.o:(yylineno)
>>> defined at lex.c
>>>            lex.o:(.data+0x0)
cc: error: linker command failed with exit code 1 (use -v to see invocation)
*** [piewm] Error code 1

make[1]: stopped in /wrkdirs/usr/ports/x11-wm/piewm/work/piewm-1.04
1 error


I confess that I don't know enough about actually using lex, yacc, and their
work-alikes to "un-duplicate"  yylineno.  I can, however, patch the port's
Makefile to include "CFLAGS+=-fcommon", so that's what I'm doing for now.

Note: I strongly suspect that x11-wm/tvtwm is similarly affected (and that if a
"real fix" is put forth for it, that a similar fix will apply to x11-wm/piewm).

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