>>> Source compiled.    
>>> Test phase [not enabled]: media-libs/musicbrainz-2.1.2
                        
>>> Install musicbrainz-2.1.2 into /var/tmp/portage/musicbrainz-2.1.2/image/ category media-libs
Making install in include
make[1]: Entering directory `/var/tmp/portage/musicbrainz-2.1.2/work/libmusicbrainz-2.1.2/include'
Making install in musicbrainz
make[2]: Entering directory `/var/tmp/portage/musicbrainz-2.1.2/work/libmusicbrainz-2.1.2/include/musicbrainz'
make[3]: Entering directory `/var/tmp/portage/musicbrainz-2.1.2/work/libmusicbrainz-2.1.2/include/musicbrainz'
make[3]: Nothing to be done for `install-exec-am'.
test -z "/usr/include/musicbrainz" || mkdir -p -- "/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz"
 /bin/install -c -m 644 'browser.h' '/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz/browser.h'
*** glibc detected *** double free or corruption (out): 0x080e8c90 ***
/bin/sh: line 1: 26681 Aborted                 /bin/install -c -m 644 "$d$p" "/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz/$f"
 /bin/install -c -m 644 'errors.h' '/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz/errors.h'
*** glibc detected *** double free or corruption (out): 0x080e8c90 ***
/bin/sh: line 1: 26685 Aborted                 /bin/install -c -m 644 "$d$p" "/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz/$f"
 /bin/install -c -m 644 'mb_c.h' '/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz/mb_c.h'
*** glibc detected *** double free or corruption (out): 0x080e8c90 ***
/bin/sh: line 1: 26689 Aborted                 /bin/install -c -m 644 "$d$p" "/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz/$f"
 /bin/install -c -m 644 'musicbrainz.h' '/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz/musicbrainz.h'
*** glibc detected *** double free or corruption (out): 0x080e8c90 ***
/bin/sh: line 1: 26693 Aborted                 /bin/install -c -m 644 "$d$p" "/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz/$f"
 /bin/install -c -m 644 'queries.h' '/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz/queries.h'
*** glibc detected *** double free or corruption (out): 0x080e8c90 ***
/bin/sh: line 1: 26697 Aborted                 /bin/install -c -m 644 "$d$p" "/var/tmp/portage/musicbrainz-2.1.2/image//usr/include/musicbrainz/$f"
make[3]: *** [install-mb_incHEADERS] Error 134
make[3]: Leaving directory `/var/tmp/portage/musicbrainz-2.1.2/work/libmusicbrainz-2.1.2/include/musicbrainz'
make[2]: *** [install-am] Error 2
make[2]: Leaving directory `/var/tmp/portage/musicbrainz-2.1.2/work/libmusicbrainz-2.1.2/include/musicbrainz'
make[1]: *** [install-recursive] Error 1
make[1]: Leaving directory `/var/tmp/portage/musicbrainz-2.1.2/work/libmusicbrainz-2.1.2/include'
make: *** [install-recursive] Error 1

!!! ERROR: media-libs/musicbrainz-2.1.2 failed.
Call stack:
  ebuild.sh, line 1545:   Called dyn_install
  ebuild.sh, line 1019:   Called src_install
  musicbrainz-2.1.2.ebuild, line 36:   Called die

!!! make install failed
!!! If you need support, post the topmost build error, and the call stack if relevant.