Eigen/src/misc/lapacke_mangling.h

#ifndef LAPACK_HEADER_INCLUDED
#define LAPACK_HEADER_INCLUDED

#ifndef LAPACK_GLOBAL
#if defined(LAPACK_GLOBAL_PATTERN_LC) || defined(ADD_)
#define LAPACK_GLOBAL(lcname, UCNAME) lcname##_
#elif defined(LAPACK_GLOBAL_PATTERN_UC) || defined(UPPER)
#define LAPACK_GLOBAL(lcname, UCNAME) UCNAME
#elif defined(LAPACK_GLOBAL_PATTERN_MC) || defined(NOCHANGE)
#define LAPACK_GLOBAL(lcname, UCNAME) lcname
#else
#define LAPACK_GLOBAL(lcname, UCNAME) lcname##_
#endif
#endif

#endif