dnl ** check for more functions
dnl ** The following have been verified to be used in ghc/, but might be used somewhere else, too.
AC_CHECK_FUNCS([getclock getrusage gettimeofday setitimer siginterrupt sysconf times ctime_r])
+dnl ** On OS X 10.4 (at least), time.h doesn't declare ctime_r if
+dnl ** _POSIX_C_SOURCE is defined
+AC_CHECK_DECLS([ctime_r], , ,
+[#define _POSIX_SOURCE 1
+#define _POSIX_C_SOURCE 199506L
+#include <time.h>])
+
dnl ** For ghc/rts/gmp:
AC_CHECK_FUNCS([getpagesize])
#include <time.h>
#endif
+/* HACK: On Mac OS X 10.4 (at least), time.h doesn't declare ctime_r with
+ * _POSIX_C_SOURCE. If this is the case, we declare it ourselves.
+ */
+#if HAVE_CTIME_R && !HAVE_DECL_CTIME_R
+extern char *ctime_r(const time_t *, char *);
+#endif
+
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif