diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 7fe40e2c..2382d6dc 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -16,6 +16,8 @@ test_big_endian(WORDS_BIGENDIAN)
 
 tde_setup_largefiles( )
 
+check_symbol_exists( strlcpy "string.h" HAVE_STRLCPY_PROTO )
+check_symbol_exists( strlcat "string.h" HAVE_STRLCAT_PROTO )
 
 ##### check for gcc visibility support #########
 
diff --git a/config.h.cmake b/config.h.cmake
index eb51aa52..6a53137b 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -49,6 +49,11 @@
 #cmakedefine HAVE_LIBXSS 1
 
 // mimelib
+#cmakedefine HAVE_STRLCPY_PROTO
+
+#cmakedefine HAVE_STRLCAT_PROTO
+
+#if !defined(HAVE_STRLCPY_PROTO)
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -56,7 +61,9 @@ unsigned long strlcpy(char*, const char*, unsigned long);
 #ifdef __cplusplus
 }
 #endif
+#endif
 
+#if !defined(HAVE_STRLCAT_PROTO)
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -64,3 +71,4 @@ unsigned long strlcat(char*, const char*, unsigned long);
 #ifdef __cplusplus
 }
 #endif
+#endif