daemon.c broken on OpenBSD

Wow.

    gcc -o daemon.o -c -g -O2 -Wall -I/usr/local/include -L/usr/local/lib -Dstrcasestr=gitstrcasestr -DNO_STRCASESTR=1 -DSHA1_HEADER='<openssl/sha.h>' daemon.c
    In file included from /usr/include/sys/poll.h:54,
                     from daemon.c:7:
    /usr/include/ctype.h:67: error: syntax error before ']' token
    /usr/include/ctype.h:68: error: syntax error before ']' token
    /usr/include/ctype.h:70: error: syntax error before ']' token
    /usr/include/ctype.h:75: error: syntax error before ']' token
    /usr/include/ctype.h:78: error: syntax error before '(' token
    /usr/include/ctype.h:79: error: syntax error before '(' token
    /usr/include/ctype.h:93: error: syntax error before "c"
    In file included from /usr/include/sys/poll.h:54,
                     from daemon.c:7:
    /usr/include/ctype.h:91:1: unterminated #if
    /usr/include/ctype.h:40:1: unterminated #ifndef
    In file included from daemon.c:7:
    /usr/include/sys/poll.h:53:1: unterminated #ifndef
    /usr/include/sys/poll.h:28:1: unterminated #ifndef
    gmake: *** [daemon.o] Error 1

Apparently something in the early lines of daemon.c (before line 7)
is defining something that breaks the core /usr/include/ctype.h.

Lines 66 to 68 of ctype.h look like:

    #if defined(__GNUC__) || defined(_ANSI_LIBRARY) || defined(lint)
    int	isalnum(int);
    int	isalpha(int);

If that rings a bell, help me out here.  I'm guessing "isalnum" is getting
defined (wrongly).  Yeah, looks like in cache.h.  Why is this getting
defined?

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