[CMake] How do I get ExternalProject_Add to install libs/programs with sudo access

[Ruben Di Battista]

If I’m not mistaken, you should be able to change the install prefix using the CMAKE_ARGS option in the Configure step. This is my ExternalProject_Add I use to download third party stuff. Things enclosed by @ are replaced at configure time by correct names/URLs. 

```
ExternalProject_Add(
    @TP_PACKAGE_NAME@
    GIT_REPOSITORY @TP_PACKAGE_GIT_REPOSITORY@
    GIT_TAG "master"
    GIT_PROGRESS TRUE 
    UPDATE_COMMAND ${GIT_EXECUTABLE} pull
    LOG_DOWNLOAD ON
    LOG_CONFIGURE ON
    LOG_BUILD ON
    INSTALL_DIR "@TP_PACKAGE_INSTALL_DIR@"
    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR> -DCMAKE_CXX_FLAGS='-g'
)
```

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https://rdb.is

On 23 June 2019 at 23:08:43, Gonzalo Garramuño (ggarra13 at gmail.com) wrote:

I am in the process of adding ExternalProject_Add commands to my program  
and I find them to work okay, except when they get to the install step.   
Once they reach the install, they fail as they don't have super user  
access to install in /usr/local/, which is where I want them.  

How do you work around this with ExternalProject_Add?  

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