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In my code I use a header file which unfortunately has a different location under different Linux distributions.
In my case it is fitsio.h from cfitsio which is located here in OpenSUSE 12.1:
#include <cfitsio/fitsio.h>
and here in Arch Linux:
#include <fitsio.h>
I guess I can use some preprocessor directives to create a switch. I can use this to test if I am on Linux or Windows, etc. but I have no clue what I can use to test whether I am on Arch Linux or not.
Or is there another way/strategy to handle this case?
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To avoid multiple inclusions of the same header file we use the #ifndef, #define and #endif preprocessor directives. Just write the entire program in only file and include headers once only. You can use the conditional preprocessor directive named #ifndef to check whether that symbolic name has already been assigned.
The C library's header files include the kernel header files from the “linux” subdirectory. The system's libc headers are usually installed at the default location /usr/include and the kernel headers in subdirectories under that (most notably /usr/include/linux and /usr/include/asm).
The angle brackets (<>) cause the preprocessor to search for the header file in the standard place for header files on your system, usually the /usr/include directory.
gcc -I adds include directory of header files.
Keep the simpler include
#include <fitsio.h>
Then, under additional include directories, list paths to directories containing this header both for SUSE and for Arch:
/path/to/header/cfitsio
/path/to/header
Even if the former is nonexistent on Arch, it won't lead to any problems during compilation.
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