File jpeg-7-cplusplus.patch of Package mingw64-jpeg
--- jpeglib.h 2009-04-30 18:16:10.000000000 +0200 +++ jpeglib.h 2009-10-14 00:05:41.000000000 +0200 @@ -14,6 +14,10 @@ #ifndef JPEGLIB_H #define JPEGLIB_H +#ifdef __cplusplus +extern "C" { +#endif + /* * First we include the configuration files that record how this * installation of the JPEG library is set up. jconfig.h can be @@ -1132,4 +1136,8 @@ #endif #endif +#ifdef __cplusplus +} /* extern "C" */ +#endif + #endif /* JPEGLIB_H */