use tcc for compiler

options.h

@@ -132,9 +132,9 @@ static Rune ccursor            = 0x2603; /* Snowman ("☃") */
  *    Bold affects lines thickness if boxdraw_bold is not 0. Italic is ignored.
  * 0: Disable boxdraw (render all U25XX glyphs normally from the font).
  */
-int boxdraw = 1; /* Enable boxdraw */
-int boxdraw_bold = 1; /* Draw boxdraw bold */
-int boxdraw_braille = 1; /* Render braille as adjecent pixels */
+int boxdraw = 0; /* Enable boxdraw */
+int boxdraw_bold = 0; /* Draw boxdraw bold */
+int boxdraw_braille = 0; /* Render braille as adjecent pixels */
 
 /* Undercurl options
  * 

options.mk

@@ -1,6 +1,9 @@
 # st version
 VERSION = 1.0
 
+# compiler and linker
+CC = tcc
+
 # Customize below to fit your system
 
 # paths
@@ -37,6 +40,3 @@ STLDFLAGS = $(LIBS) $(LDFLAGS)
 #       `$(PKG_CONFIG) --libs harfbuzz` \
 #       `$(PKG_CONFIG) --libs freetype2`
 #MANPREFIX = ${PREFIX}/man
-
-# compiler and linker
-# CC = c99