Fixed test for iconv_t

configure.ac

@@ -278,11 +278,15 @@ AM_GNU_GETTEXT_VERSION(0.12.1)
 
 # Iconv
 AM_ICONV
-AC_CHECK_HEADERS(iconv.h,
-                 [AC_CHECK_TYPE(iconv_t,:,
-                                AC_DEFINE(iconv_t, int,
-                                          [Conversion descriptor type]),
-                                [#include <iconv.h>])])
+AC_CHECK_HEADERS(iconv.h)
+AC_CHECK_TYPE(iconv_t,:,
+              AC_DEFINE(iconv_t, int,
+                        [Conversion descriptor type]),
+              [
+#ifdef HAVE_ICONV_H
+# include <iconv.h>
+#endif
+])
 
 AC_OUTPUT([Makefile\
            doc/Makefile\