WinSDK stdlib.h has only abs function for int, long, long long and __int64 parameteres, cstdlib has the abs function with a double parameter

libvips/conversion/composite.cpp

@@ -47,7 +47,11 @@
 
 #include <stdio.h>
 #include <string.h>
+#if _MSC_VER
+#include <cstdlib>
+#else
 #include <stdlib.h>
+#endif
 #include <math.h>
 
 #include <vips/vips.h>

libvips/iofuncs/generate.c

@@ -102,6 +102,9 @@
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif /*HAVE_UNISTD_H*/
+#ifdef HAVE_IO_H
+#include <io.h>
+#endif /*HAVE_IO_H*/
 
 #include <vips/vips.h>
 #include <vips/internal.h>