new Portfile for libbert

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see ​https://github.com/ruediger/libbert

[ryandesign (Ryan Carsten Schmidt)]

You don't need to specify the homepage because the github portgroup does that for you.

Instead of manually specifying a build dependency on cmake and changing configure.pre_args, why not use the cmake portgroup?

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1. done

2. doesn't work, because the port group cmake does an in source build

CMake Error at CMakeLists.txt:44 (message):
  In-source builds are not permitted.  Make a separate folder for building:

  mkdir build; cd build; cmake ..

  Before that, remove the files that cmake just created:

  rm -rf CMakeCache.txt CMakeFiles

[mf2k (Frank Schima)]

The revision line needs to be deleted.

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Done...

[drkp (Dan Ports)]

Thanks, I committed the port in r89890.

Let's call the license just zlib because the beer clause doesn't actually affect the license and I didn't feel like adding to the approved licenses list.

[ryandesign (Ryan Carsten Schmidt)]

Replying to mail@…:

2. doesn't work, because the port group cmake does an in source build

Ah, so it uses cmake, but has a wrapper configure script that does an out-of-source build. Well, ok. Note that many of the ports that use the cmake portgroup add code to do an out-of-source build. It might make sense to modify the cmake portgroup to let it do out-of-source builds. I've filed #33259 for that.

[ryandesign (Ryan Carsten Schmidt)]

Not using the cmake portgroup had the consequence that the install_name of the libraries was not set, which makes the libraries unusable. See #51335. Fixed in r148864.