prefix	= /usr
bindir	= /usr/bin
mandir	= /usr/man
infodir	= /usr/info
libungif check
  1st:
$$~test.c:1:1: warning: return type defaults to 'int' [-Wimplicit-int]
    1 | main()
      | ^~~~
libungif: yes
libjpeg: disabled
libpng: disabled
bmp: yes
fb: /dev/fb0
LIBS	= -lgif 
#define IDSTRING "fbv 1.0b, s-tech"
#define DEFAULT_FRAMEBUFFER "/dev/fb0"
#define FBV_SUPPORT_GIF
#define FBV_SUPPORT_BMP