Fix the Linux build.

src/Makefile

@@ -384,18 +384,25 @@ endif
         BIN = ../bin/grafx2
         COPT = -W -Wall -Wdeclaration-after-statement -std=c99 -c -g $(shell sdl-config --cflags) $(TTFCOPT) $(LUACOPT) $(JOYCOPT) -O$(OPTIM)
         COPT += $(shell pkg-config --cflags libpng)
+
         ifneq ($(PLATFORM), FreeBSD)
           COPT += -D_XOPEN_SOURCE=700
         endif
+
         LOPT = $(shell sdl-config --libs) -lSDL_image $(TTFLOPT)
         LOPT += $(shell pkg-config --libs libpng)
         LOPT += $(LUALOPT) -lm
-		LOPT += -liconv
         CC = gcc
         OBJDIR = ../obj/unix
         FCLOPT = -lfontconfig
+
         # enable UTF8 filename translation
+        # For Linux (GLibc), iconv is built into the C library so no LOPT needed.
         COPT += -DENABLE_FILENAMES_ICONV
+        ifneq ($(PLATFORM),Linux)
+          LOPT += -liconv
+        endif
+
       endif
       endif
       endif