【发布时间】：2012-12-26 05:49:45
【问题描述】：
我正在尝试在我的 Ubuntu 12.04 计算机上为 histograms of oriented gradients 设置一个名为 fastHOG 的库。当我尝试编译off-the-shelf fastHOG code 时，编译器抱怨它找不到fltk/run.h。根据Rahul Ashok's tutorial about fastHOG，我需要安装Fast Light Toolkit (FLTK) 2.0。该教程说 2.0 以外的 FLTK 版本不起作用。
所以，我正在尝试编译 FLTK 2.0 (svn co http://svn.easysw.com/public/fltk/fltk/trunk fltk-2.0)。当我在fltk-2.0 文件夹中执行make 时，会出现undefined reference to 'FcInit' 之类的错误。
关于如何正确编译 FLTK 2.0 的任何建议？
这是我在 Ubuntu 12.04 上使用 g++ 4.6.3 构建 FLTK 2.0 时得到的完整错误打印输出：
...
Linking fluid2...
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::list_fonts(fltk::Font**&): error: undefined reference to 'FcInit'
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::list_fonts(fltk::Font**&): error: undefined reference to 'FcPatternCreate'
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::list_fonts(fltk::Font**&): error: undefined reference to 'FcObjectSetBuild'
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::list_fonts(fltk::Font**&): error: undefined reference to 'FcFontList'
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::list_fonts(fltk::Font**&): error: undefined reference to 'FcPatternDestroy'
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::list_fonts(fltk::Font**&): error: undefined reference to 'FcPatternGetString'
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::list_fonts(fltk::Font**&): error: undefined reference to 'FcFontSetDestroy'
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::Font::sizes(int*&): error: undefined reference to 'FcPatternGetDouble'
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::Font::sizes(int*&): error: undefined reference to 'FcFontSetDestroy'
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::Font::encodings(char const**&): error: undefined reference to 'FcFontSetDestroy'
../lib/libfltk2.a(Font.o):Font.cxx:function fltk::Font::encodings(char const**&): error: undefined reference to 'FcPatternGetString' ../lib/libfltk2.a(Image.o):Image.cxx:function figure_out_visual(): error: undefined reference to 'XRenderFindStandardFormat'
../lib/libfltk2.a(Image.o):Image.cxx:function fl_xrender_draw_image(unsigned long, fltk::PixelType, fltk::Rectangle const&, fltk::Rectangle const&): error: undefined reference to 'XRenderCreatePicture'
../lib/libfltk2.a(Image.o):Image.cxx:function fl_xrender_draw_image(unsigned long, fltk::PixelType, fltk::Rectangle const&, fltk::Rectangle const&): error: undefined reference to 'XRenderSetPictureFilter'
../lib/libfltk2.a(Image.o):Image.cxx:function fl_xrender_draw_image(unsigned long, fltk::PixelType, fltk::Rectangle const&, fltk::Rectangle const&): error: undefined reference to 'XRenderSetPictureTransform'
../lib/libfltk2.a(Image.o):Image.cxx:function fl_xrender_draw_image(unsigned long, fltk::PixelType, fltk::Rectangle const&, fltk::Rectangle const&): error: undefined reference to 'XRenderComposite'
../lib/libfltk2.a(Image.o):Image.cxx:function fl_xrender_draw_image(unsigned long, fltk::PixelType, fltk::Rectangle const&, fltk::Rectangle const&): error: undefined reference to 'XRenderComposite'
../lib/libfltk2.a(Image.o):Image.cxx:function fl_xrender_draw_image(unsigned long, fltk::PixelType, fltk::Rectangle const&, fltk::Rectangle const&): error: undefined reference to 'XRenderComposite'
../lib/libfltk2.a(Image.o):Image.cxx:function fl_xrender_draw_image(unsigned long, fltk::PixelType, fltk::Rectangle const&, fltk::Rectangle const&): error: undefined reference to 'XRenderFreePicture'
collect2: ld returned 1 exit status
make[1]: *** [fluid2] Error 1
make: *** [all] Error 2
【问题讨论】：
标签： c++ gcc image-processing computer-vision fltk