Especially with pkg-config, it needs to be called with the right path
otherwise it might not pick up the prefix correctly.
Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1677
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3706>
```
# Tell pkg-config where to find the .pc files
-$ export PKG_CONFIG_PATH=/Library/Frameworks/GStreamer.framework/Libraries/pkgconfig/
+$ export PKG_CONFIG_PATH=/Library/Frameworks/GStreamer.framework/Versions/1.0/lib/pkgconfig
# We will use the pkg-config provided by the GStreamer.framework
-$ export PATH=/Library/Frameworks/GStreamer.framework/Commands/:$PATH
+$ export PATH=/Library/Frameworks/GStreamer.framework/Versions/1.0/bin:$PATH
# Compile
$ clang -c main.c -o main.o `pkg-config --cflags gstreamer-1.0`