[mythtv-users] mac build

[Craig Treleaven]

> On Feb 7, 2021, at 9:17 AM, John Hoyt <john.hoyt at gmail.com> wrote:
> 
> The key is that you don’t have to download any ports--and possibly build some from source.  An installer is kept that contains a compressed archive of all the files contained in the port. 
> 
> Thanks Craig, that is a great tip!
> 
> BTW - I'm trying a variant of your suggested "PKG_CONFIG_SYSTEM_INCLUDE_PATH" fix.
> 
> It turns out that I already have in the compile script where PKGMGR_INST_PATH=/opt/local :
> PKG_CONFIG_SYSTEM_INCLUDE_PATH=$PKGMGR_INST_PATH/include
> 
> Which I believe sets the search path to look for macports dylibs first, then the local ones - hence why a local ffmpeg install stomps the dylibs in the mythtv compile.
> 
> I'm changing that to:
> PKG_CONFIG_SYSTEM_INCLUDE_PATH=$SRC_DIR/external:$PKGMGR_INST_PATH/include
> 
> Which I hope makes the compiler / pkg_config first look for the locally compiled mythtv ffmpeg libraries.


The pkg-config environment variable works sort of the opposite that you might expect.  "PKG_CONFIG_SYSTEM_INCLUDE_PATH=${prefix}/include” means DON’T supply that include path in the list of returned directories as it is assumed to be the default (last) search path when compiling.  

I found out about this on the pkg-config mailing list:

> This isn't documented (should be), but you can override pkg-config's notion of the system include path with the environment variable PKG_CONFIG_SYSTEM_INCLUDE_PATH. If that's not set, it uses the compiled in defaults. That's been in pkg-config for a long time, so it should work with the version you have. This should be in the form of a path style variable with : separators.


Craig

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