checking size of long double... configure: error: cannot compute sizeof (long double), 77
See `config.log' for more details.

!!! ERROR: sys-libs/glibc-2.4-r3 failed.
Call stack:
  ebuild.sh, line 1545:   Called dyn_compile
  ebuild.sh, line 936:   Called src_compile
  glibc-2.4-r3.ebuild, line 1168:   Called src_compile
  glibc-2.4-r3.ebuild, line 1179:   Called toolchain-glibc_src_compile
  glibc-2.4-r3.ebuild, line 251:   Called glibc_do_configure 'nptl'
  glibc-2.4-r3.ebuild, line 941:   Called die

!!! failed to configure glibc
!!! If you need support, post the topmost build error, and the call stack if relevant.