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--- a/src/rasqal_literal.c 2013-03-29 21:22:57.413852072 +0100
+++ b/src/rasqal_literal.c 2013-03-29 21:23:34.092851757 +0100
@@ -46,10 +46,22 @@
#include <stddef.h>
#endif
#include <stdarg.h>
+#ifdef _AIX
+# ifndef isnan
+# define isnan(x) \
+ (sizeof (x) == sizeof (long double) ? isnan_ld (x) \
+ : sizeof (x) == sizeof (double) ? isnan_d (x) \
+ : isnan_f (x))
+ static inline int isnan_f (float x) { return x != x; }
+ static inline int isnan_d (double x) { return x != x; }
+ static inline int isnan_ld (long double x) { return x != x; }
+# endif
+#else
/* for isnan() */
#ifdef HAVE_MATH_H
#include <math.h>
#endif
+#endif
/* for INT_MIN and INT_MAX */
#ifdef HAVE_LIMITS_H
#include <limits.h>
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