Autotools: Document PHP environment build configuration vars #15684
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This is the first part of the #12050. I'm making these in a separate pull request because I'm still rechecking other remaining variables (EXTENSION_DIR, EXTRA_INCLUDES, EXTRA_CFLAGS, and EXTRA_LDFLAGS) if they can be done a bit differently.
So, this marks the following environment variables as precious:
Meaning, they are now also shown in the
./configure --help
output, and they can be used like this when configuring the PHP build: