nixpkgs/pkgs/applications/science/math/lp_solve/isnan.patch

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diff -u a/lp_lib.h b/lp_lib.h
--- a/lp_lib.h 2016-05-04 19:45:15.753143720 +0900
+++ b/lp_lib.h 2016-05-04 19:53:59.536920722 +0900
@@ -59,9 +59,6 @@
# if defined _WIN32 && !defined __GNUC__
# define isnan _isnan
# endif
-#if defined NOISNAN
-# define isnan(x) FALSE
-#endif
#define SETMASK(variable, mask) variable |= mask
#define CLEARMASK(variable, mask) variable &= ~(mask)