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/usr/include/clc/relational/isnan.h is in libclc-dev 0.2.0+git20180312-1.

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#define _CLC_ISNAN_DECL(RET_TYPE, ARG_TYPE) \
  _CLC_OVERLOAD _CLC_DECL RET_TYPE isnan(ARG_TYPE);

#define _CLC_VECTOR_ISNAN_DECL(RET_TYPE, ARG_TYPE) \
  _CLC_ISNAN_DECL(RET_TYPE##2, ARG_TYPE##2) \
  _CLC_ISNAN_DECL(RET_TYPE##3, ARG_TYPE##3) \
  _CLC_ISNAN_DECL(RET_TYPE##4, ARG_TYPE##4) \
  _CLC_ISNAN_DECL(RET_TYPE##8, ARG_TYPE##8) \
  _CLC_ISNAN_DECL(RET_TYPE##16, ARG_TYPE##16)

_CLC_ISNAN_DECL(int, float)
_CLC_VECTOR_ISNAN_DECL(int, float)

#ifdef cl_khr_fp64
_CLC_ISNAN_DECL(int, double)
_CLC_VECTOR_ISNAN_DECL(long, double)
#endif

#undef _CLC_ISNAN_DECL
#undef _CLC_VECTOR_ISNAN_DECL