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--- a/configure.ac	2011-04-26 12:17:33.318491903 +0200
+++ b/configure.ac	2011-04-26 12:19:57.822776369 +0200
@@ -48,10 +48,12 @@
     [PKG_CHECK_MODULES([CRYPTOPP],
 	    [libcrypto++],
 	    [have_cryptopp=yes],
-	    [AC_SEARCH_LIBS([_ZTIN8CryptoPP14CBC_EncryptionE], [crypto++ cryptopp],
+	    [AC_LANG_PUSH([C++])
+	    AC_SEARCH_LIBS([_ZTIN8CryptoPP14CBC_EncryptionE], [crypto++ cryptopp],
 		    [have_cryptopp=yes],
 		    [true],
-		    [-lpthread])])])
+		    [-lpthread])
+	    AC_LANG_POP([C++])])])
 # bail out if given explicit --with-cryptopp
 if test "x$have_cryptopp" = "xno" -a "x$with_cryptopp" != "xcheck" -a "x$with_cryptopp" != "xno"; then
     AC_MSG_FAILURE([--with-cryptopp was given, but library was not found])