des: compilation error on MacOS X

[Bruno Haible]

Hi Simon,

On MacOS X 10.3.9 the 'gc-gnulib' (or 'gc-des') module fails to build:

depbase=`echo gc-gnulib.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`;\
gcc -std=gnu99 -DHAVE_CONFIG_H -DEXEEXT=\"\" -DEXEEXT=\"\" -DNO_XMALLOC 
-DEXEEXT=\"\" -I. -I..  -I../intl -Wall  -g -O2 -MT gc-gnulib.o -MD -MP -MF 
$depbase.Tpo -c -o gc-gnulib.o gc-gnulib.c &&\
mv -f $depbase.Tpo $depbase.Po
In file included from gc-gnulib.c:65:
des.h:62: error: conflicting types for `des_setkey'
/usr/include/unistd.h:196: error: previous declaration of `des_setkey'
make[3]: *** [gc-gnulib.o] Error 1

The declaration in /usr/include/unistd.h looks like this:

int      des_setkey(const char *key);

which is clearly different from the one in gnulib's des.h:

extern void
des_setkey (des_ctx *ctx, const char * key);

Bruno