the error is following clang++ -std=c++11 -c -o /opt/scisoft64/var/tmp/portage/net-libs/webkit-gtk-2.2.6/temp/tf-CXX-2.c++.o /opt/scisoft64/var/tmp/portage/net-libs/webkit-gtk-2.2.6/temp/tf-CXX-2.c++ /opt/scisoft64/var/tmp/portage/net-libs/webkit-gtk-2.2.6/temp/tf-CXX-2.c++:1:1: error: C++ requires a type specifier for all declarations main() {} ^~~~ 1 error generated. The eclass differs from the tree version. Simply exchanging in line "main() {}" with "int main() { return(0); }" fixes the problem.
fixed, thanks