Index: src/sqliteInt.h
==================================================================
--- src/sqliteInt.h
+++ src/sqliteInt.h
@@ -2530,11 +2530,15 @@
 
 int sqlite3StatusValue(int);
 void sqlite3StatusAdd(int, int);
 void sqlite3StatusSet(int, int);
 
-int sqlite3IsNaN(double);
+#ifndef SQLITE_OMIT_FLOATING_POINT
+  int sqlite3IsNaN(double);
+#else
+# define sqlite3IsNaN(X)  0
+#endif
 
 void sqlite3VXPrintf(StrAccum*, int, const char*, va_list);
 #ifndef SQLITE_OMIT_TRACE
 void sqlite3XPrintf(StrAccum*, const char*, ...);
 #endif

Index: src/util.c
==================================================================
--- src/util.c
+++ src/util.c
@@ -29,10 +29,11 @@
   static int dummy = 0;
   dummy += x;
 }
 #endif
 
+#ifndef SQLITE_OMIT_FLOATING_POINT
 /*
 ** Return true if the floating point value is Not a Number (NaN).
 **
 ** Use the math library isnan() function if compiled with SQLITE_HAVE_ISNAN.
 ** Otherwise, we have our own implementation that works on most systems.
@@ -73,10 +74,11 @@
   rc = isnan(x);
 #endif /* SQLITE_HAVE_ISNAN */
   testcase( rc );
   return rc;
 }
+#endif /* SQLITE_OMIT_FLOATING_POINT */
 
 /*
 ** Compute a string length that is limited to what can be stored in
 ** lower 30 bits of a 32-bit signed integer.
 **