linx上安装sdl_ttf2.0.11库

[qq_40366394]

/bin/bash ./libtool --tag=CC --mode=link gcc -g -O2 -I/usr/local/include/freetype2 -I/usr/local/include -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/local/include/SDL -o showfont showfont.o libSDL_ttf.la -L/usr/local/lib -lfreetype -lz -L/usr/local/lib -Wl,-rpath,/usr/local/lib -lSDL -lpthread
libtool: link: gcc -g -O2 -I/usr/local/include/freetype2 -I/usr/local/include -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/local/include/SDL -o .libs/showfont showfont.o -Wl,-rpath -Wl,/usr/local/lib ./.libs/libSDL_ttf.so -L/usr/local/lib /usr/local/lib/libfreetype.so -lz /usr/local/lib/libSDL.so -lm -ldl -lpthread
/usr/local/lib/libSDL.so: undefined reference to `_XGetRequest'
collect2: error: ld returned 1 exit status
Makefile:368: recipe for target 'showfont' failed
执行make后就出现这个问题，不知道怎么改，那位大神帮帮忙，着急！！！

[zhxianbin]

undefined reference to `_XGetRequest' 是不是有什么文件没编译，或者没有加入链接