Index: Source/bmalloc/libpas/src/libpas/pas_committed_pages_vector.c
--- Source/bmalloc/libpas/src/libpas/pas_committed_pages_vector.c.orig
+++ Source/bmalloc/libpas/src/libpas/pas_committed_pages_vector.c
@@ -68,6 +68,8 @@ void pas_committed_pages_vector_construct(pas_committe
         if (result && (mem_info.State & MEM_COMMIT))
             vector->raw_data[i] = (unsigned char) 1;
     }
+#elif PAS_OS(OPENBSD)
+    /* no mincore on OpenBSD */
 #else
     PAS_SYSCALL(mincore(object, size, vector->raw_data));
 #endif
