Ubuntu Installation Issue

[ryandgoldenberg1]

Unable to install on Ubuntu 20.04 following the directions from the cmake file here:
https://github.com/yhirose/cpp-httplib/blob/master/CMakeLists.txt#L26
Here's the output:

ryan@drogon:~/Desktop/cpp-httplib$ mkdir build
ryan@drogon:~/Desktop/cpp-httplib$ cd build
ryan@drogon:~/Desktop/cpp-httplib/build$ cmake -DCMAKE_BUILD_TYPE=Release ..
-- The CXX compiler identification is GNU 9.3.0
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for C++ include pthread.h
-- Looking for C++ include pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
CMake Error at /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:226 (message):
  No REQUIRED_VARS specified for FIND_PACKAGE_HANDLE_STANDARD_ARGS()
Call Stack (most recent call first):
  cmake/FindBrotli.cmake:176 (find_package_handle_standard_args)
  CMakeLists.txt:146 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/ryan/Desktop/cpp-httplib/build/CMakeFiles/CMakeOutput.log".
See also "/home/ryan/Desktop/cpp-httplib/build/CMakeFiles/CMakeError.log".

I have brotli installed via apt:

ryan@drogon:~/Desktop/cpp-httplib/build$ apt list | grep brotli

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

brotli/focal,now 1.0.7-6build1 amd64 [installed]
...

[yhirose]

@ryandgoldenberg1, I guess you have to install the libbrotli-dev package instead of the brotli package.
@sum01, do you have any comment on this?

[ryandgoldenberg1]

No luck, after installing libbrotli-dev I get another error:

ryan@drogon:~/Desktop/cpp-httplib/build$ cmake -DCMAKE_BUILD_TYPE=Release ..
-- The CXX compiler identification is GNU 9.3.0
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for C++ include pthread.h
-- Looking for C++ include pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
CMake Error at cmake/FindBrotli.cmake:139 (add_library):
  add_library cannot create ALIAS target "Brotli::common" because target
  "PkgConfig::Brotli_common" is imported but not globally visible.
Call Stack (most recent call first):
  CMakeLists.txt:146 (find_package)


CMake Error at cmake/FindBrotli.cmake:139 (add_library):
  add_library cannot create ALIAS target "Brotli::decoder" because target
  "PkgConfig::Brotli_decoder" is imported but not globally visible.
Call Stack (most recent call first):
  CMakeLists.txt:146 (find_package)


CMake Error at cmake/FindBrotli.cmake:139 (add_library):
  add_library cannot create ALIAS target "Brotli::encoder" because target
  "PkgConfig::Brotli_encoder" is imported but not globally visible.
Call Stack (most recent call first):
  CMakeLists.txt:146 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/ryan/Desktop/cpp-httplib/build/CMakeFiles/CMakeOutput.log".
See also "/home/ryan/Desktop/cpp-httplib/build/CMakeFiles/CMakeError.log".

After turning off the Brotli flags in the build it works OK though, so closing.

[sum01]

I actually was testing this on MinGW and ran into that same error with the add_library cannot create ALIAS target "Brotli::XYZ". I have a fix for that.

I wasn't able to re-create the REQUIRED_VARS error, but I suppose I can kind of work around it to fix it hopefully.

[sum01]

@ryandgoldenberg1 Hopefully #604 fixes the problem for you. If not, just at me.