Fake it 'til you make it.

Index: runtime/druntime/src/core/sys/openbsd/sys/link_elf.d
--- runtime/druntime/src/core/sys/openbsd/sys/link_elf.d.orig
+++ runtime/druntime/src/core/sys/openbsd/sys/link_elf.d
@@ -10,6 +10,7 @@ version (OpenBSD):
 
 extern (C) nothrow @system:
 
+import core.stdc.stdint : uint64_t;
 import core.sys.posix.config;
 import core.sys.posix.sys.types;
 import core.sys.openbsd.sys.elf;
@@ -55,6 +56,10 @@ struct dl_phdr_info
     char*           dlpi_name;
     ElfW!"Phdr"*    dlpi_phdr;
     ElfW!"Half"     dlpi_phnum;
+    uint64_t        dlpi_adds;
+    uint64_t        dlpi_subs;
+    size_t          dlpi_tls_modid;
+    void*           dlpi_tls_data;
 }
 
 
