... Bootstrapping Ant Distribution
... Compiling Ant Classes
Error occurred during initialization of VM
Could not reserve enough space for code cache
... Failed compiling Ant classes !
Bootstrap FAILED

!!! ERROR: dev-java/ant-core-1.6.5-r14 failed.
Call stack:
  ebuild.sh, line 1614:   Called dyn_compile
  ebuild.sh, line 971:   Called qa_call 'src_compile'
  environment, line 4780:   Called src_compile
  ant-core-1.6.5-r14.ebuild, line 43:   Called die

!!! failed to build
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/dev-java/ant-core-1.6.5-r14/temp/build.log'.

!!! When you file a bug report, please include the following information:
GENTOO_VM=blackdown-jdk-1.4.2  CLASSPATH="" JAVA_HOME="/opt/blackdown-jdk-1.4.2.03"
JAVACFLAGS="-source 1.4 -target 1.4" COMPILER=""
and of course, the output of emerge --info