+dnl ** figure out whether C compiler supports 'long long's
+dnl (Closely based on Andreas Zeller's macro for testing
+dnl for this under C++)
+dnl
+dnl If the C compiler supports `long long' types,
+dnl define `HAVE_LONG_LONG'.
+dnl
+AC_DEFUN(FPTOOLS_C_LONG_LONG,
+[
+AC_REQUIRE([AC_PROG_CC])
+AC_MSG_CHECKING(whether ${CC} supports long long types)
+AC_CACHE_VAL(fptools_cv_have_long_long,
+[
+AC_LANG_SAVE
+AC_LANG_C
+AC_TRY_COMPILE(,[long long a;],
+fptools_cv_have_long_long=yes,
+fptools_cv_have_long_long=no)
+AC_LANG_RESTORE
+])
+AC_MSG_RESULT($fptools_cv_have_long_long)
+if test "$fptools_cv_have_long_long" = yes; then
+AC_DEFINE(HAVE_LONG_LONG)
+fi
+])
+
+dnl *** Can we open files in binary mode? ***
+dnl
+AC_DEFUN(FPTOOLS_O_BINARY,
+[
+AC_REQUIRE([AC_PROG_CC])
+AC_MSG_CHECKING(whether we can open files in binary mode)
+AC_CACHE_VAL(fptools_cv_have_o_binary,
+[
+AC_LANG_SAVE
+AC_LANG_C
+AC_TRY_COMPILE(,
+[#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+int x = O_BINARY;],
+fptools_cv_have_o_binary=yes,
+fptools_cv_have_o_binary=no)
+AC_LANG_RESTORE
+])
+AC_MSG_RESULT($fptools_cv_have_o_binary)
+if test "$fptools_cv_have_o_binary" = yes; then
+AC_DEFINE(HAVE_O_BINARY)
+fi
+])
+