How to fix "duplicate symbol" error in tcl compilation

[jchavez1992]

I found two possible solutions to the following error:

duplicate symbol '_fixstrtod' in:
    strtod.o
    fixstrtod.o
ld: 1 duplicate symbol for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [libtcl8.4.dylib] Error 1
make: *** [tcl] Error 1

Option 1:

Add #undef strtod in compat/strtod.c (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=440683)

+++ tcl8.4-8.4.15/compat/strtod.c	2007-09-03 17:23:28.000000000 +0100
@@ -62,6 +62,8 @@
  *----------------------------------------------------------------------
  */
 
+#undef strtod
+
 double
 strtod(string, endPtr)
     CONST char *string;		/* A decimal ASCII floating-point number,

Option 2:

Comment (or remove) the line in the tcl8.4.11/unix/configure file LIBOBJS="$LIBOBJS strtod.o" (seen in the diff attached to this forum https://sourceforge.net/p/tcl/bugs/3129/)

RCS file: /cvsroot/tcl/tcl/unix/configure,v
retrieving revision 1.92.2.45
diff -u -r1.92.2.45 configure
--- configure   27 Nov 2005 02:34:41 -0000      1.92.2.45
+++ configure   1 Dec 2005 00:39:27 -0000
@@ -6443,7 +6443,7 @@

 if test "$tcl_ok" = 0; then
     test -n "$verbose" && echo "       Adding strtod.o."
-    LIBOBJS="$LIBOBJS strtod.o"
+#   LIBOBJS="$LIBOBJS strtod.o"
 fi

I have tried both, and both remove the duplicate symbol error. My question, as a complete outsider to C programming, which method is better?