--- libhttp/httpconnection.c
+++ libhttp/httpconnection.c
@@ -66,7 +66,7 @@
 #ifdef HAVE_STRLCAT
 #define strncat(a,b,c) ({ char *_a = (a); strlcat(_a, (b), (c)+1); _a; })
 #endif
-#ifndef HAVE_ISNAN
+#if !defined(isnan) /* configure check for isnan is not suitable for cross-compiling */
 #define isnan(x) ({ typeof(x) _x = (x); _x != _x; })
 #endif
 #define max(a, b) ({ typeof(a) _a = (a); typeof(b) _b = (b);                  \
--- configure
+++ configure
@@ -10714,6 +10714,7 @@
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
 
+if false; then
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <math.h>
@@ -10732,6 +10733,7 @@
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
+fi
 
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */