* Package:    dev-java/maven-bin-3.8.1
 * Repository: gentoo
 * Maintainer: java@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox splitdebug userpriv usersandbox
 * Using: openjdk-bin-8
>>> Unpacking source...
>>> Unpacking apache-maven-3.8.1-bin.tar.gz to /var/tmp/portage/dev-java/maven-bin-3.8.1/work
>>> Source unpacked in /var/tmp/portage/dev-java/maven-bin-3.8.1/work
>>> Preparing source in /var/tmp/portage/dev-java/maven-bin-3.8.1/work/apache-maven-3.8.1 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-java/maven-bin-3.8.1/work/apache-maven-3.8.1 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-java/maven-bin-3.8.1/work/apache-maven-3.8.1 ...
java-pkg-2_src_compile: build.xml not found so nothing to do.
>>> Source compiled.
>>> Test phase [not enabled]: dev-java/maven-bin-3.8.1

>>> Install dev-java/maven-bin-3.8.1 into /var/tmp/portage/dev-java/maven-bin-3.8.1/image
>>> Completed installing dev-java/maven-bin-3.8.1 into /var/tmp/portage/dev-java/maven-bin-3.8.1/image

 * Final size of build directory: 11192 KiB (10.9 MiB)
 * Final size of installed tree:  10976 KiB (10.7 MiB)

strip: x86_64-pc-linux-gnu-strip --strip-unneeded -N __gentoo_check_ldflags__ -R .comment -R .GCC.command.line -R .note.gnu.gold-version
   /usr/share/maven-bin-3.8/lib/jansi-native/linux32/libjansi.so
   /usr/share/maven-bin-3.8/lib/jansi-native/linux64/libjansi.so
 * checking 90 files for package collisions
 * This package will overwrite one or more files that may belong to other
 * packages (see list below). You can use a command such as `portageq
 * owners / <filename>` to identify the installed package that owns a
 * file. If portageq reports that only one package owns a file then do
 * NOT file a bug report. A bug report is only useful if it identifies at
 * least two or more packages that are known to install the same file(s).
 * If a collision occurs and you can not explain where the file came from
 * then you should simply ignore the collision since there is not enough
 * information to determine if a real problem exists. Please do NOT file
 * a bug report at https://bugs.gentoo.org/ unless you report exactly
 * which two packages install the same file(s). See
 * https://wiki.gentoo.org/wiki/Knowledge_Base:Blockers for tips on how
 * to solve the problem. And once again, please do NOT file a bug report
 * unless you have completely understood the above message.
 * 
 * Detected file collision(s):
 * 
 * 	/usr/lib/debug/.build-id/e9/631fef334d8b32619da859129c3d315e0475ac
 * 	/usr/lib/debug/.build-id/e9/631fef334d8b32619da859129c3d315e0475ac.debug
 * 	/usr/lib/debug/.build-id/5f/b40ad650b711da4eb18584bccb731d0211e2af
 * 	/usr/lib/debug/.build-id/5f/b40ad650b711da4eb18584bccb731d0211e2af.debug
 * 
 * Searching all installed packages for file collisions...
 * 
 * Press Ctrl-C to Stop
 * 
 * dev-java/maven-bin-3.6.3:3.6::gentoo
 * 	/usr/lib/debug/.build-id/5f/b40ad650b711da4eb18584bccb731d0211e2af
 * 	/usr/lib/debug/.build-id/5f/b40ad650b711da4eb18584bccb731d0211e2af.debug
 * 	/usr/lib/debug/.build-id/e9/631fef334d8b32619da859129c3d315e0475ac
 * 	/usr/lib/debug/.build-id/e9/631fef334d8b32619da859129c3d315e0475ac.debug
 * 
 * Package 'dev-java/maven-bin-3.8.1' NOT merged due to file collisions.
 * If necessary, refer to your elog messages for the whole content of the
 * above message.
!!! When you file a bug report, please include the following information:
GENTOO_VM=openjdk-bin-8  CLASSPATH="" JAVA_HOME="/opt/openjdk-bin-8.292_p10"
JAVACFLAGS="-source 1.8 -target 1.8" COMPILER=""
and of course, the output of emerge --info =maven-bin-3.8.1