--- a/configure.ac	2022-12-15 10:33:13.845801113 +0300
+++ b/configure.ac	2022-12-15 10:33:39.828949903 +0300
@@ -342,6 +342,9 @@
 LIBS="$LIBS -ldb"
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
     #include <db.h>
+    #ifdef HAVE_STDLIB_H
+        #include <stdlib.h>
+    #endif
     int main() 
     {
         int major, minor, patch;
@@ -377,6 +378,9 @@
 
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
     #include <db.h>
+    #ifdef HAVE_STDLIB_H
+        #include <stdlib.h>
+    #endif
     int main() 
     {
         int major, minor, patch;