在安装cartographer的依赖时，报了这个错

Zln4ever

ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
cartographer_rviz: [libabsl-dev] defined as "not available" for OS version [focal]
cartographer: [libabsl-dev] defined as "not available" for OS version [focal]
cartographer_ros: [libabsl-dev] defined as "not available" for OS version [focal]
Continuing to install resolvable dependencies...
#All required rosdeps installed successfully

Zln4ever

@Zln4ever 用了rosdepc install -r --from-paths src --ignore-src --rosdistro $ROS_DISTRO -y这条指令教程里的

小鱼

@Zln4ever 请提供ros版本，系统版本，代码前后操作

Zln4ever

@小鱼 foxy版本

1.rodepc update
2.rosdepc install -r --from-paths src --ignore-src --rosdistro $ROS_DISTRO -y 第一次好像没有报错 3.然后colcon build --packages-up-to cartographer_ros编译报错 CMake Error at CMakeLists.txt:32 (find_package):
By not providing "Findabsl.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "absl", but
CMake did not find one.

4.又回到第一步

小鱼

@Zln4ever 根据我的判断，foxy版本并不依赖absl,所以应该是你代码版本搞错了，你是不是看了humble版本的教程，如果是，请右上角跳转至foxy版本。

Zln4ever

@小鱼谢鱼哥真是麻烦你了

Gene

@小鱼自己系统是 ubuntu18.04 [amd64:bionic]，ROS 版本是 melodic。在操作安装 cartographer 时， rosdepc install -r --from-paths src --ignore-src --rosdistro melodic -y 命令后出现 error:

ERROR: the following packages/stacks could not have their rosdepc keys resolved
to system dependencies:
cartographer: [libabsl-dev] defined as "not available" for OS version [bionic]

自己看了该板块内容，依旧没有思路，还请指点一下，感谢。

小鱼

@Gene ubuntu18估计你要自己手动下载libabsl的源码进行安装了