https://github.com/termux/termux-packages/issues/15852

--- a/opal/util/malloc.h
+++ b/opal/util/malloc.h
@@ -18,6 +18,9 @@
 
 /** @file */
 
+#include_next <malloc.h>
+#ifdef BEGIN_C_DECLS
+
 #ifndef OPAL_MALLOC_H
 #define OPAL_MALLOC_H
 
@@ -143,3 +146,5 @@
 END_C_DECLS
 
 #endif /* OPAL_MALLOC_H */
+
+#endif