root@tuantub-laptop:/home/tuantub/Desktop/xvnkb-0.2.9a# ./configure 

Configuration for xvnkb 0.2.9a on Linux

  Type "./configure --help" for more information

Checking uchar... no
Checking ushort... yes
Checking uint... yes
Checking ulong... yes
Checking dynamic linking loader... yes
Checking X11 lib... /usr/X11R6
Checking pkg-config... yes
Checking Xft... yes

Compile options:
  Enable XFT: yes
  Enable spell checking: yes
  Enable extended keystroke: no
  Enable ABC liked Telex keystroke: no
done.

Type "make" to compile

root@tuantub-laptop:/home/tuantub/Desktop/xvnkb-0.2.9a# make
cc -fpic -O3 -s -fomit-frame-pointer -D_REENTRANT -DUSE_XFT -I/usr/include/freetype2   -DVERSION=\"0.2.9a\" -Wall -I/usr/X11R6/include -c xvnkb.c
In file included from typedefs.h:24,
                 from xvnkb.c:32:
config.h:1: error: expected identifier or ‘(’ before ‘-’ token
config.h:1: error: stray ‘#’ in program
In file included from typedefs.h:24,
                 from xvnkb.c:32:
config.h:7:2: error: #endif without #if
In file included from xvnkb.c:32:
typedefs.h:28: warning: data definition has no type or storage class
typedefs.h:28: warning: type defaults to ‘int’ in declaration of ‘vk_methods’
xvnkb.c: In function ‘key_handler’:
xvnkb.c:155: error: ‘VKM_OFF’ undeclared (first use in this function)
xvnkb.c:155: error: (Each undeclared identifier is reported only once
xvnkb.c:155: error: for each function it appears in.)
xvnkb.c: In function ‘XNextEvent’:
xvnkb.c:347: error: ‘VKM_OFF’ undeclared (first use in this function)
make: *** [xvnkb.o] Error 1

-e #ifndef __VK_CONFIG_H
#define __VK_CONFIG_H
#define VK_CHECK_SPELLING
#define VK_NEED_UCHAR
#endif