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diff --git a/cmake/tuklib_mbstr.cmake b/cmake/tuklib_mbstr.cmake
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+#
+# tuklib_mbstr.cmake - see tuklib_mbstr.m4 for description and comments
+#
+# Author: Lasse Collin
+#
+# This file has been put into the public domain.
+# You can do whatever you want with this file.
+#
+
+include(${CMAKE_CURRENT_LIST_DIR}/tuklib_common.cmake)
+include(CheckSymbolExists)
+
+function(tuklib_mbstr TARGET_OR_ALL)
+ check_symbol_exists(mbrtowc wchar.h HAVE_MBRTOWC)
+ tuklib_add_definition_if(${TARGET_OR_ALL} HAVE_MBRTOWC)
+
+ # NOTE: wcwidth() requires _GNU_SOURCE or _XOPEN_SOURCE on GNU/Linux.
+ check_symbol_exists(wcwidth wchar.h HAVE_WCWIDTH)
+ tuklib_add_definition_if(${TARGET_OR_ALL} HAVE_WCWIDTH)
+endfunction()