openbsd has but errors out when you use this header

4f8bb1e4 · Michael Jerris · 36f1e5e2 · 4f8bb1e4
--- a/libs/spandsp/src/alloc.c
+++ b/libs/spandsp/src/alloc.c
@@ -41,7 +41,7 @@
 #define __ISO_C_VISIBLE 2011
 #endif
 #include <stdlib.h>
-#if defined(HAVE_MALLOC_H)
+#if defined(HAVE_MALLOC_H) && !defined(__OpenBSD__)
 #include <malloc.h>
 #endif
 #include <inttypes.h>