localhost / # cat '/var/tmp/portage/app-admin/syslog-ng-2.0.6/temp/build.log' 
>>> Unpacking source...
>>> Unpacking syslog-ng-2.0.6.tar.gz to /var/tmp/portage/app-admin/syslog-ng-2.0.6/work
 * Replacing obsolete head/tail with POSIX compliant ones
 *  - fixed configure
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/app-admin/syslog-ng-2.0.6/work/syslog-ng-2.0.6 ...
./configure --prefix=/usr --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --sysconfdir=/etc/syslog-ng --disable-dependency-tracking --enable-ipv6 --enable-dynamic-linking --disable-static-linking --disable-spoof-source --enable-tcp-wrapper --libdir=/usr/lib64 --build=x86_64-pc-linux-gnu
checking for a BSD-compatible install... /bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for x86_64-pc-linux-gnu-gcc... x86_64-pc-linux-gnu-gcc
checking for C compiler default output file name... 
configure: error: C compiler cannot create executables
See `config.log' for more details.

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/app-admin/syslog-ng-2.0.6/work/syslog-ng-2.0.6/config.log

!!! ERROR: app-admin/syslog-ng-2.0.6 failed.
Call stack:
  ebuild.sh, line 1614:   Called dyn_compile
  ebuild.sh, line 971:   Called qa_call 'src_compile'
  environment, line 1276:   Called src_compile
  syslog-ng-2.0.6.ebuild, line 36:   Called econf '--sysconfdir=/etc/syslog-ng' '--disable-dependency-tracking' '--enable-ipv6' '--enable-dynamic-linking' '--disable-static-linking' '--disable-spoof-source' '--enable-tcp-wrapper'
  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/app-admin/syslog-ng-2.0.6/temp/build.log'.