--- a/src/common/classes/FpeControl.h	2020-06-26 12:02:51.000000000 +0200
+++ b/src/common/classes/FpeControl.h	2020-09-17 06:04:30.516565361 +0200
@@ -42,6 +42,10 @@
 #include <ieeefp.h>
 #endif
 
+#if !defined(__GLIBC__)
+#define isinf std::isinf
+#endif
+
 namespace Firebird
 {