'iostream.h' file not found, c++98 : Trying to compile old cpp project as per http://stackoverflow.com/questions/12606713/enforcing-the-c98-standard-in-gcc.

When I run the command `g++ -std=c++98 -pedantic -ggdb  -c file.cxx` it errs out with the error `fatal error: 'iostream.h' file not found`. 

I'm using brew, gcc5, on a mac El Capitan. 

    gcc --version
    Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
    Apple LLVM version 8.0.0 (clang-800.0.38)
    Target: x86_64-apple-darwin15.6.0
    Thread model: posix
    InstalledDir:   /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

