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10. Second Example: Xloadimage

This example poses an easier problem. The xloadimage program seemed a useful addition to my set of graphic tools. I copied the xloadi41.gz file directly from the source directory on the CD included with the excellent X User Tools book, by Mui and Quercia. As expected, tar xzvf unarchives the files. The make , however, produces a nasty-looking error and terminates. 


gcc -c -O -fstrength-reduce -finline-functions -fforce-mem
-fforce-addr -DSYSV  -I/usr/X11R6/include
-DSYSPATHFILE=\"/usr/lib/X11/Xloadimage\" mcidas.c

In file included from /usr/include/stdlib.h:32,
                 from image.h:23,
                 from xloadimage.h:15,
                 from mcidas.c:7:
/usr/lib/gcc-lib/i486-linux/2.6.3/include/stddef.h:215:
conflicting types for `wchar_t'
/usr/X11R6/include/X11/Xlib.h:74: previous declaration of
`wchar_t'
make[1]: *** [mcidas.o] Error 1
make[1]: Leaving directory
`/home/thegrendel/tst/xloadimage.4.1'
make: *** [default] Error 2

The error message contains the essential clue.

Looking at the file image.h , line 23... 


       #include <stdlib.h>

Aha, somewhere in the source for xloadimage , wchar_t has been redefined from what was specified in the standard include file, stdlib.h . Let us first try commenting out line 23 in image.h , as perhaps the stdlib.h include is not, after all, necessary.

At this point, the build proceeds without any fatal errors. The xloadimage package functions correctly now.

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