Calculating dependencies... done!

!!! The ebuild selected to satisfy "=dev-
db/mariadb-10.0*[embedded=,minimal=,static=,static-
libs=,abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?]"
 
has unmet requirements.
- dev-db/mariadb-10.0.15-r1::gentoo USE="community pam perl ssl xml -cluster -
debug -embedded -extraengine -jemalloc -latin1 -max-idx-128 -minimal -odbc -
oqgraph -profiling (-selinux) -sphinx -static -static-libs -systemtap -
tcmalloc -test -tokudb" ABI_X86="64 -32 -x32"

  The following REQUIRED_USE flag constraints are unsatisfied:
    xml? ( extraengine )

  The above constraints are a subset of the following complete expression:
    odbc? ( extraengine !minimal ) xml? ( extraengine !minimal ) minimal? ( 
!oqgraph !sphinx ) tokudb? ( jemalloc ) tcmalloc? ( !jemalloc ) jemalloc? ( 
!tcmalloc ) minimal? ( !cluster !extraengine !embedded ) static? ( !ssl )

(dependency required by "virtual/mysql-5.6-r2" [ebuild])
(dependency required by "dev-db/mysql-connector-c++-1.1.3" [installed])
(dependency required by "app-office/libreoffice-4.2.8.2[mysql]" [installed])
(dependency required by "@selected" [set])
(dependency required by "@world" [argument])


Can you please remind me what the above message means?  What is the meaning of 
the question mark after xml?  I remember this has been answered before (at 
least by Alan) but I can't seem to find the thread just now.


USE="xml" seems to be part of the default settings on this box:
=================================
global use flags (searching: xml)
************************************************************
[+  D   ] xml - Add support for XML files
=================================

while USE="extraengine" is not set and I'm not sure I need it:
========================================
local use flags (searching: extraengine)
************************************************************
[-      ] extraengine
    dev-db/mariadb: Add support for alternative storage engines (Archive, 
    CSV, Blackhole, Federated(X), Partition)
        [-  ] 5.5.40-r1 [gentoo]
        [-  ] 5.5.41 [gentoo]
        [-  ] 10.0.15 [gentoo]
        [-  ] 10.0.15-r1 [gentoo]
========================================

What is it asking me to do?

-- 
Regards,
Mick

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