diff --git a/Makefile b/Makefile
index e22701e..2979d29 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,12 @@ yaitaa: lib
 obj/%.o: src/%.c
 	$(CC) $(CFLAGS) $^ $(INCLUDES) -DVERSION="\"$(VERSION)\"" -c -o $@
 
-testbuild:
-	make clean all CC=clang
+testbuild: use_clang use_tcc
 	make clean all
 	oclint src/*.c
+
+use_clang:
+	make clean all CC=clang
+
+use_tcc:
+	make clean all CC=tcc CFLAGS="$(CFLAGS) -DSTBI_NO_SIMD"
diff --git a/src/args.h b/src/args.h
index c6490d4..b23241a 100644
--- a/src/args.h
+++ b/src/args.h
@@ -1,5 +1,5 @@
 /*
- * yaitaa - yet another image to ascii art converter
+ *  yaitaa - yet another image to ascii art converter
  *  Copyright (C) 2022  hatkidchan <hatkidchan at gmail dot com>
  *
  *  This program is free software: you can redistribute it and/or modify
diff --git a/src/colors.h b/src/colors.h
index 07a2c44..e894285 100644
--- a/src/colors.h
+++ b/src/colors.h
@@ -1,5 +1,5 @@
 /*
- * yaitaa - yet another image to ascii art converter
+ *  yaitaa - yet another image to ascii art converter
  *  Copyright (C) 2022  hatkidchan <hatkidchan at gmail dot com>
  *
  *  This program is free software: you can redistribute it and/or modify
diff --git a/src/fmt_strings.h b/src/fmt_strings.h
index 1c28ed8..4719ecb 100644
--- a/src/fmt_strings.h
+++ b/src/fmt_strings.h
@@ -1,3 +1,20 @@
+/*
+ *  yaitaa - yet another image to ascii art converter
+ *  Copyright (C) 2022  hatkidchan <hatkidchan at gmail dot com>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 #ifndef _FMT_STRINGS_H
 #define _FMT_STRINGS_H
 
diff --git a/src/image.h b/src/image.h
index 3e28073..ed41e01 100644
--- a/src/image.h
+++ b/src/image.h
@@ -1,5 +1,5 @@
 /*
- * yaitaa - yet another image to ascii art converter
+ *  yaitaa - yet another image to ascii art converter
  *  Copyright (C) 2022  hatkidchan <hatkidchan at gmail dot com>
  *
  *  This program is free software: you can redistribute it and/or modify
diff --git a/src/mod_braille.c b/src/mod_braille.c
index 22e072f..3d664cb 100644
--- a/src/mod_braille.c
+++ b/src/mod_braille.c
@@ -46,11 +46,8 @@ void mod_braille_main(asc_state_t state)
 {
   image_t *img = state.image;
   
-  uint8_t braille_char = 0x00;
-  rgba8 block[8];
-  
-  rgba8 color_max, color_min;
-  int dist_max, dist_min, dist_min_d = 0xffffff, dist;
+  rgba8 bright, dark, block[8];
+  int dist_max, dist_min, dist;
   
   __bra_start_output(state);
   for (int y = 0; y < img->height; y += 4)
@@ -60,35 +57,33 @@ void mod_braille_main(asc_state_t state)
     for (int x = 0; x < img->width; x += 2)
     {
       __bra_update2x4(img, block, x, y);
-      color_max = color_min = block[0];
 
-      dist_max = 0;
-      dist_min = dist_min_d;
+      bright = dark = block[0];
+      dist_max = 0; dist_min = 0xFFFFFF;
       for (int i = 0; i < 8; i++)
       {
         dist = color_difference(block[i], PURE_BLACK);
         if (dist < dist_min)
         {
           dist_min = dist;
-          color_min = block[i];
+          dark = block[i];
         }
         if (dist > dist_max)
         {
           dist_max = dist;
-          color_max = block[i];
+          bright = block[i];
         }
       }
       
-      braille_char = 0x00;
+      uint8_t pixel = 0x00;
       for (int i = 0; i < 8; i++)
       {
-        if (__bra_best_match_i(color_min, color_max, block[i]) != 0)
+        if (__bra_best_match_i(dark, bright, block[i]) != 0)
         {
-          braille_char |= (1 << i);
+          pixel |= (1 << i);
         }
       }
-      __bra_put_pixel(state, color_min, color_max,
-          braille_char, x >= (img->width - 2));
+      __bra_put_pixel(state, dark, bright, pixel, x >= (img->width - 2));
     }
     __bra_end_line(state, final);
   }
@@ -108,11 +103,6 @@ void __bra_putc_raw(asc_state_t state, uint8_t ch)
   fputc(0x80 | ((ccode >> 0) & 0x3f), state.out_file);
 }
 
-void __bra_putc_esc(asc_state_t state, uint8_t ch)
-{
-  fprintf(state.out_file, "\\u28%02x", ch);
-}
-
 void __bra_start_output(asc_state_t state)
 {
   int w = state.image->width / 2, h = state.image->height / 4;
diff --git a/src/version.h b/src/version.h
index add3d47..5a8c946 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1,3 +1,20 @@
+/*
+ *  yaitaa - yet another image to ascii art converter
+ *  Copyright (C) 2022  hatkidchan <hatkidchan at gmail dot com>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 #ifndef _VERSION_H_
 #define _VERSION_H_