diff -up digikam-7.9.0/core/libs/dngwriter/extra/dng_sdk/dng_string.cpp.include digikam-7.9.0/core/libs/dngwriter/extra/dng_sdk/dng_string.cpp
--- digikam-7.9.0/core/libs/dngwriter/extra/dng_sdk/dng_string.cpp.include	2022-12-03 06:19:37.000000000 -0700
+++ digikam-7.9.0/core/libs/dngwriter/extra/dng_sdk/dng_string.cpp	2023-02-12 19:28:02.938446869 -0700
@@ -23,9 +23,7 @@
 #include <windows.h>
 #endif
 
-#if qiPhone || qAndroid
-#include <ctype.h> // for isdigit
-#endif
+#include <cctype> // for isdigit
 
 /*****************************************************************************/