trying to create FC4 rpm of rdup-0.2.13

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I'm trying to create an RPM package for my Fedora Core 4 machine of
rdup-0.2.13, based on Vitaly Lipatov's work at
ftp://ftp.altlinux.ru/pub/distributions/ALTLinux/Sisyphus/i586/SRPMS.classic/rdup-0.2.13-alt0.1.src.rpm

Using the slightly modified spec file, attached, rpmbuild now gets as
far as the %build section, failing with:
        gcc -Wall -W -Werror -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2
        -fexceptions -m32 -march=i386 -mtune=pentium4
        -fasynchronous-unwind-tables -DHAVE_CONFIG_H -Os
        -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -Wpointer-arith
        -Wstrict-prototypes -I/usr/include/glib-2.0
        -I/usr/lib/glib-2.0/include   -c rdup.c
        cc1: warnings being treated as errors
        rdup.c: In function 'main':
        rdup.c:288: warning: ignoring return value of 'ftruncate',
        declared with attribute warn_unused_result
        make: *** [rdup.o] Error 1
        error: Bad exit status from /var/tmp/rpm-tmp.16255 (%build)

Finally, I've tracked this down to the default CFLAGS of FC4's rpmbuild,
which include -Wp,-D_FORTIFY_SOURCE=2

Being neither a C programmer nor an rpm expert, I'm now seeking the
answer to either of these questions:

1) How to patch rdup so that it compiles with -Wp,-D_FORTIFY_SOURCE=2  ?
or
2) An efficient way to remove that CFLAG from %configure, using the spec
file  (in other words, without requiring a change to any rpmrc file)?

thanks in anticipation
-- 
Graham King <[email protected]>

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