hi all i've just installed ubuntu, and when i try to compile something with gcc it seems to work but tells me that stdlib.h and stdio.h are not recognised as files, and that i'm implicitly declaring the built-in printf. anyone know how to fix this? how can it run gcc but not recognise the standard libraries? gcc is definitely there (i've run gcc -v and it gives me a recent version number, and as i said, it is attempting to compile). any help would be appreciated. cheers cactus

If you post the offending source you will probably get more help.

hi guy the source was the standard hello world! program which had already compiled and run with the knoppix live cd, so there's nothing to it. the problem is with the ubuntu installation of gcc.

If we see the output from the compilation, we may be able to deduce what is missing. You may have the gcc package installed, but are other development packages needed? I use Mandriva here so I am unsure how Ubuntu organizes their packages and dependencies. I have found that installing the kernel source package insures the installation of any additional software needed for development. I also get the impression that some distributions also need to install packages containing header files for development (the header files are included in the packages named {packagename}-devel in the Mandriva distribution). Even though all you are doing is compiling a "Hello World" program, the full output from execution of the compiler may yield useful information to those who frequent this forum and do software development. The more information we have, the better the chance we will see what the trouble is and be able to help. You should understand that the people who frequent forums such as this one are not being paid for their time and will ask for better information if what is provided is believed to be inadequate. For many of us, this is a way of giving a little something back to the Linux community, but it is not an obligation. With that said, if you expect others to do all the work or guess at what the problem may be, you will find that you do not get much useful help. This link may help: How to ask questions the smart way. Please do not take offense at my reply. My only intent is to help, Ernie Registered Linux User 247790 ICQ 41060744

ernie - thanks for reminding me that the compiler output might be important! cactus - post the source post compiler output post output of these commands: locate stdio.h dpkg -S stdio.h

hi all i appreciate your attempts to help, and i'll get onto the request. i can't get onto the internet via ubuntu, so i'm in windows when i post. i hadn't posted the precise compiler output but my first post was intended to say that i get 2 standard messages with the usual wording that i can't now precisely recall:- 1. the standard message when gcc can't find an include file - something to the effect of "cannot find file stdib.h" and "cannot find file stdio.h", then; 2. identifying the main function and the WARNING about implicitly declaring an in-built function, in this case "printf". that's the whole output. sorry, but i can't remember the exact words of those. the source was variations of this:- #include <stdlib.h> #include <stdio.h> int main() { printf("Hello world!"); return 0; } i also tried leaving off the .h extensions, using " " rather than < >, and even including <cstdlib> variations. i'll check the 2 other suggested commands when i get back onto ubuntu. thanks for efforts to date. cactus

hi all have run the following 2 commands, both yielding the same result. locate stdio.h AND dpkg -S stdio.h RESULT: /usr/lib/perl.5.8.8/CORE/nostdio.h I also tried downloading gcc and the tiny compiler, but both required a gcc installed already, so they wouldn't install. This is on a fresh install of ubuntu from the CD. gcc -v gives me an up-to-date version, but when I try to run code it tells me it can't find stdio.h or stdlib.h. Has anyone else had this problem? Cheers cactus