[Bug 236548] devel/p4: build error when using DEFAULT_VERSIONS+=ssl=libressl-devel in make.conf

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236548

            Bug ID: 236548
           Summary: devel/p4: build error when using
                    DEFAULT_VERSIONS+=ssl=libressl-devel in make.conf
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: asomers at FreeBSD.org
          Reporter: tphilipp at potion-studios.com
             Flags: maintainer-feedback?(asomers at FreeBSD.org)
          Assignee: asomers at FreeBSD.org

devel/p4 fails to build with the following error when selecting libressl-devel
as default ssl provider (at least for libressl 2.9.0, unsure about libressl of
the non-devel port):

  /usr/bin/ld: error: undefined symbol: X509_get_X509_PUBKEY

This is due to the fact that /usr/include/openssl/x509.h is included instead of
/usr/local/include/openssl/x509.h, the former declaring X509_get_X509_PUBKEY as
a symbol whereas the latter implements it as a macro.

Changing the include order and assuring that the build looks at the libressl
headers, works, e.g.:

  cd /usr/ports/devel/p4
  sudo make CPATH=/usr/local/include:/usr/include


I think that this could also lead to problems with openssl from ports, instead
of the one from base, as the base includes from /usr/include will be used
instead of the ones from ports?

I am not sure what the best way would be to fix this, but I guess the Makefile
should be changed to make sure this includes the matching headers for all
possible combinations, openssl (from base or ports) or libressl.

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