树莓派的官方V4L2驱动，如何在Makefile中添加lrt标志？

Question

我正在创建一个小的Python应用程序，使用的是树莓派上的v4l。经过几个小时的排查，我快要安装成功了。现在只需要编译官方的V4L2驱动程序。

我在按照这个教程进行操作：https://www.ics.com/blog/raspberry-pi-camera-module#.VAaCHqM0_YQ

当我到达编译的步骤时，出现了这个错误：undefined reference to symbol 'clock_gettime'

我在谷歌上搜索了一下，发现需要“在链接的库列表中添加 -lrt”，或者把它放到makefile里。我对make和configure一点都不了解。我试着读了一点，但我这是为了工作，没时间去上课。我不知道该怎么办……请帮帮我……

我还应该提到，我不知道该修改makefile、makefile.in还是configure？我试着把"-lrt"放进makefile里，但这太复杂了，搞不清楚该放在哪里。

这是实际的错误信息：

Making all in v4l2-compliance
make[3]: Entering directory '/home/pi/v4l-utils/utils/v4l2-compliance'
  CXXLD  v4l2-compliance
/usr/bin/ld: v4l2-test-buffers.o: undefined reference to symbol 'clock_gettime@@
GLIBC_2.4'
//lib/arm-linux-gnueabihf/librt.so.1: error adding symbols: DSO missing from com
mand line
collect2: ld returned 1 exit status
Makefile:388: recipe for target 'v4l2-compliance' failed
make[3]: *** [v4l2-compliance] Error 1
make[3]: Leaving directory '/home/pi/v4l-utils/utils/v4l2-compliance'
Makefile:347: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/home/pi/v4l-utils/utils'
Makefile:386: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/pi/v4l-utils'
Makefile:315: recipe for target 'all' failed
make: *** [all] Error 2

我尝试编辑Makefile，发现有一行是“LIBS=”，我把它改成了“LIBS=-lrt”，但这并没有解决问题。

我在Makefile的第388行找到了这一段内容：

# This directory's subdirectories are mostly independent; you can cd
# into them and run `make' without going through this Makefile.
# To change the values of `make' variables: instead of editing Makefiles,
# (1) if the variable is set in `config.status', edit `config.status'
#     (which will cause the Makefiles to be regenerated when you run `make');
# (2) otherwise, pass the desired values on the `make' command line.
$(RECURSIVE_TARGETS):
    @fail= failcom='exit 1'; \
    for f in x $$MAKEFLAGS; do \
      case $$f in \
        *=* | --[!k]*);; \
        *k*) failcom='fail=yes';; \
      esac; \
    done; \
    dot_seen=no; \
    target=`echo $@ | sed s/-recursive//`; \
    list='$(SUBDIRS)'; for subdir in $$list; do \
      echo "Making $$target in $$subdir"; \
      if test "$$subdir" = "."; then \
        dot_seen=yes; \
        local_target="$$target-am"; \
      else \
        local_target="$$target"; \
      fi; \
      ($(am__cd) $$subdir && $(MAKE) $(AM_MAKEFLAGS) $$local_target) \
      || eval $$failcom; \
    done; \
    if test "$$dot_seen" = "no"; then \
      $(MAKE) $(AM_MAKEFLAGS) "$$target-am" || exit 1; \
    fi; test -z "$$fail"

所以我试着这样运行make：make CFLAGS='-lrt'，但这也没有任何效果。我查看了config.status，这又是一个让我困惑的文件。

驱动程序编译配置文件错误调试 makefile 树莓派 V4L2 lrt标志

树莓派的官方V4L2驱动，如何在Makefile中添加lrt标志？

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