compilation error: sys/mman.h: No such file or directory

[ghost]

Did not found mman.h on x86-64 (Ubuntu GNOME) because the sys folder doesn't exist.
I replaced sys with linux and everything is working now:

libc6-dev-i386: /usr/include/sys/mman.h

linux-libc-dev: /usr/include/linux/mman.h

[erikd]

I would consider this an Ubuntu (and possibly even a Debian) bug.

According to the msync man page:

SYNOPSIS
       #include <sys/mman.h>

       int msync(void *addr, size_t length, int flags);
.....

CONFORMING TO
       POSIX.1-2001.

If its conforming to a POSIX spec, it should not be under /usr/include/linux and it should be in the location specified by the man page.

In your particular instance, I would just install the libc6-dev-i386 package.

I'm pretty sure you need to install the libc6-dev package which installs the sys/mman.h file at
/usr/include/x86_64-linux-gnu/sys/mman.h. GCC will automatically find this file because /usr/include/x86_64-linux-gnu/ is on the default search path.

[erikd]

Ok, to close this? Installing the libc6-dev package should fix it.

[ghost]

You're right!

libc6-dev: /usr/include/x86_64-linux-gnu/sys/mman.h

The file was missing on my system. sudo apt-get install --reinstall libc6-dev solved!