checking for an ANSI C-conforming const... yes
checking for size_t... yes
checking whether time.h and sys/time.h may both be included... yes
checking for curl_off_t... yes
@@checking size of curl_off_t... configure: error: cannot compute sizeof (curl_off_t), 77
See `config.log' for more details.

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/net-misc/curl-7.15.1-r1/work/curl-7.15.1/config.log

!!! ERROR: net-misc/curl-7.15.1-r1 failed.
Call stack:
  ebuild.sh, line 1614:   Called dyn_compile
  ebuild.sh, line 971:   Called qa_call 'src_compile'
  environment, line 3147:   Called src_compile
  curl-7.15.1-r1.ebuild, line 83:   Called econf '--enable-ldap' '--without-libidn' '--disable-gssapi' '--enable-ipv6' '--enable-http' '--enable-ftp' '--enable-gopher' '--enable-file' '--enabe-dict' '--enable-manual' '--enable-telnet' '--enable-nonblocking' '--enable-largefile' '--disable-ares' '--disable-krb4' '--without-gnutls' '--with-ssl=/usr'
  ebuild.sh, line 577:   Called die

!!! econf failed
!!! 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/net-misc/curl-7.15.1-r1/temp/build.log'.