[MacPorts] #55909: mariadb-10.2 @10.2.12: opportunistic use of numerous libraries and programs

[MacPorts]

#55909: mariadb-10.2 @10.2.12: opportunistic use of numerous libraries and programs
------------------------+--------------------------
 Reporter:  ryandesign  |      Owner:  pixilla
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  mariadb-10.2
------------------------+--------------------------
 mariadb-10.2 finds and uses a number of things if present, though it does
 not declare dependencies on them:

  * pkg-config
  * boost
  * bzip2
  * cracklib (crack.h)
  * gdb (bfd.h)
  * git
  * kerberos5 (GSSAPI)
  * libxml2
  * lzo2
  * openssl
  * pcre
  * snappy (snappy-c.h)
  * xz (liblzma)
  * and something do with with ODBC (`ODBC_OK`)

 One or more of these is causing the build to fail for me, unless I use
 trace mode. The port should declare dependencies on whichever of these it
 wants to use, and add flags or whatever to prevent the use of the others.

 I did not test other mariadb versions but assume at least some of this
 applies to them too.

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Ticket URL: <https://trac.macports.org/ticket/55909>
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