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Fixes "multiple definition" errors when building with GCC 10+.
Based on <https://bugs.gentoo.org/show_bug.cgi?id=706706>.
--- a/fig2dev/dev/gensvg.c 2010-07-01 22:41:16.000000000 +0200
+++ b/fig2dev/dev/gensvg.c 2022-02-27 20:02:33.379945500 +0100
@@ -230,10 +230,12 @@
};
/* arrowhead arrays */
-Point points[50], fillpoints[50], clippoints[50];
-int npoints, nfillpoints, nclippoints;
-int arrowx1, arrowy1; /* first point of object */
-int arrowx2, arrowy2; /* second point of object */
+Point fillpoints[50];
+int nfillpoints;
+extern Point points[50], clippoints[50];
+extern int npoints, nclippoints;
+extern int arrowx1, arrowy1; /* first point of object */
+extern int arrowx2, arrowy2; /* second point of object */
static int tileno=0; /* number of current tile */
--- a/fig2dev/fig2dev.h 2010-03-16 19:53:20.000000000 +0100
+++ b/fig2dev/fig2dev.h 2022-02-27 19:56:06.072253991 +0100
@@ -126,7 +126,7 @@
extern char *prog, *from, *to;
extern char *name;
extern double font_size;
-Boolean correct_font_size; /* use correct font size */
+extern Boolean correct_font_size; /* use correct font size */
extern double mag, fontmag;
extern FILE *tfp;
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