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<TITLE>Building and Installing Software Packages for Linux: Second Example: Xloadimage</TITLE>
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<H2><A NAME="s10">10. Second Example: Xloadimage</A></H2>
<P>This example poses an easier problem. The <EM>xloadimage</EM> program
seemed a useful addition to my set of graphic tools. I copied the
<CODE>xloadi41.gz</CODE> file directly from the source directory on the CD
included with the excellent
<A HREF="Software-Building-HOWTO-16.html#refs">X User Tools</A> book, by
Mui and Quercia. As expected, <EM>tar xzvf</EM> unarchives the files.
The <EM>make</EM>, however, produces a nasty-looking error and
terminates.
<P>
<BLOCKQUOTE><CODE>
<PRE>
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
</PRE>
</CODE></BLOCKQUOTE>
<P>The error message contains the essential clue.
<P>Looking at the file <CODE>image.h</CODE>, line 23...
<BLOCKQUOTE><CODE>
<PRE>
#include <stdlib.h>
</PRE>
</CODE></BLOCKQUOTE>
<P>Aha, somewhere in the source for <EM>xloadimage</EM>, <EM>wchar_t</EM>
has been redefined from what was specified in the standard include file,
<CODE>stdlib.h</CODE>. Let us first try commenting out line 23 in
<CODE>image.h</CODE>, as perhaps the <EM>stdlib.h include</EM> is
not, after all, necessary.
<P>At this point, the build proceeds without any fatal errors. The
<EM>xloadimage</EM> package functions correctly now.
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