+# we need SIGINT in TopHandler.lhs
+FP_CHECK_CONSTS([SIGINT], [
+#if HAVE_SIGNAL_H
+#include <signal.h>
+#endif])
+
+dnl ** can we open files in binary mode?
+FP_CHECK_CONST([O_BINARY], [#include <fcntl.h>], [0])
+
+# We can't just use AC_SEARCH_LIBS for this, as on OpenBSD the iconv.h
+# header needs to be included as iconv_open is #define'd to something
+# else. We therefore use our own FP_SEARCH_LIBS_PROTO, which allows us
+# to give prototype text.
+FP_SEARCH_LIBS_PROTO(iconv,
+ [
+#include <stddef.h>
+#include <iconv.h>
+ ],
+ [iconv_t cd;
+ cd = iconv_open("", "");
+ iconv(cd,NULL,NULL,NULL,NULL);
+ iconv_close(cd);],
+ iconv,
+ [EXTRA_LIBS="$EXTRA_LIBS $ac_lib"],
+ [case `uname -s` in
+ MINGW*|CYGWIN*) ;;
+ *)
+ AC_MSG_ERROR([iconv is required on non-Windows platforms]);;
+ esac])
+
+# If possible, we use libcharset instead of nl_langinfo(CODESET) to
+# determine the current locale's character encoding.
+FP_SEARCH_LIBS_PROTO(
+ [locale_charset],
+ [#include <libcharset.h>],
+ [const char* charset = locale_charset();],
+ [charset],
+ [AC_DEFINE([HAVE_LIBCHARSET], [1], [Define to 1 if you have libcharset.])
+ EXTRA_LIBS="$EXTRA_LIBS $ac_lib"])
+
+
+AC_SUBST(EXTRA_LIBS)
+AC_CONFIG_FILES([base.buildinfo])