Xen users - Apr 2010 - implicit declaration of function `posix_memalign''

I''m attempting to compile Xen 4 on RHEL4.  Yes, I know RHEL4 is old and
I should upgrade, but certain application vendors who cannot seem to stay
current within 5 years are forcing me to stick with some older versions. 
Anyway, I''m getting the following error:

make -C xenpaging install
make[3]: Entering directory
`/usr/src/redhat/BUILD/xen-4.0.0/tools/xenpaging''
gcc  -O2 -fomit-frame-pointer -m64 -fno-strict-aliasing -std=gnu99 -Wall
-Wstrict-prototypes -Wno-unused-value -Wdeclaration-after-statement 
-D__XEN_TOOLS__ -MMD -MF .xenpaging.o.d  -D_LARGEFILE_SOURCE
-D_LARGEFILE64_SOURCE  -I ../../tools/python/xen/lowlevel/xc -I ./
-I../../tools/libxc -I../../tools/include -I../../tools/xenstore
-I../../tools/include -Werror -Wno-unused -g -D__USE_XOPEN2K
-Wp,-MD,.xenpaging.o.d -c -o xenpaging.o xenpaging.c
xenpaging.c: In function `init_page'':
xenpaging.c:51: warning: implicit declaration of function
`posix_memalign''
make[3]: *** [xenpaging.o] Error 1
make[3]: Leaving directory
`/usr/src/redhat/BUILD/xen-4.0.0/tools/xenpaging''
make[2]: *** [subdir-install-xenpaging] Error 2
make[2]: Leaving directory `/usr/src/redhat/BUILD/xen-4.0.0/tools''
make[1]: *** [subdirs-install] Error 2
make[1]: Leaving directory `/usr/src/redhat/BUILD/xen-4.0.0/tools''
make: *** [install-tools] Error 2

The posix_memalign function is declared in /usr/include/stdlib.h (which is
included in xenpaging.c):

#ifdef __USE_XOPEN2K
/* Allocate memory of SIZE bytes with an alignment of ALIGNMENT.  */
extern int posix_memalign (void **__memptr, size_t __alignment, size_t __size)
     __THROW __nonnull ((1));
#endif

So, I edit the Makefile in tools/xenpaging and add the line:
CFLAGS += -D__USE_XOPEN2K

However, when I recompile, I get the same error.  There also seems to be another
condition in stdlib.h that must be satisfied before the __USE_XOPEN2K one will
be checked:
#ifndef __need_malloc_and_calloc

I''m not sure whether this is defined (or not defined) somewhere else in
Xen - anyone have any ideas?

Thanks - Nick



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