fix bug: msg.c_str

lyblsgo

2023-04-11 dc8a0445d5460af16e9926a492a85da592f224bb

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libdir=@LIB_INSTALL_DIR@
includedir=@INCLUDE_INSTALL_ROOT_DIR@
 
Name: Yaml-cpp
Description: A YAML parser and emitter for C++
Version: @YAML_CPP_VERSION@
Requires:
Libs: -L${libdir} -lyaml-cpp
Cflags: -I${includedir}