I used package-manager. I installed development-environment. However, include-file of glibc was not installed. I searched glibc, and installed it.
gcc Requires: glibc-devel and glibc-devel Requires: glibc-headers which contains stdlib.h (and the rest of headers). So, if you have the compiler installed, you also have the headers installed, if you don't have the compiler installed, I don't see what the headers would be good for.
My explanation is bad, and I am sorry. I installed all the bound things in a category of a development-environment with a package-manager(pirut). But then the header of glibc did not enter. Therefore I searched glibc-devel glibc-headers and installed it. In fedora6, there did not need to be such thing.
I installed all the things in a category of development-environment. And gcc was installed, too. However, is not what a header of glibc is not installed in strange?