Index: ext/digest/md5/extconf.rb
===================================================================
--- ext/digest/md5/extconf.rb	(revision 27218)
+++ ext/digest/md5/extconf.rb	(working copy)
@@ -13,6 +13,7 @@
 if !with_config("bundled-md5") &&
     have_library("crypto") && have_header("openssl/md5.h")
   $objs << "md5ossl.#{$OBJEXT}"
+  $objs << "md5.#{$OBJEXT}"
 
 else
   $objs << "md5.#{$OBJEXT}"
Index: ext/digest/rmd160/extconf.rb
===================================================================
--- ext/digest/rmd160/extconf.rb	(revision 27218)
+++ ext/digest/rmd160/extconf.rb	(working copy)
@@ -13,6 +13,7 @@
 if !with_config("bundled-rmd160") &&
     have_library("crypto") && have_header("openssl/ripemd.h")
   $objs << "rmd160ossl.#{$OBJEXT}"
+  $objs << "rmd160.#{$OBJEXT}"
 else
   $objs << "rmd160.#{$OBJEXT}"
 end
Index: ext/digest/sha1/extconf.rb
===================================================================
--- ext/digest/sha1/extconf.rb	(revision 27218)
+++ ext/digest/sha1/extconf.rb	(working copy)
@@ -13,6 +13,7 @@
 if !with_config("bundled-sha1") &&
     have_library("crypto") && have_header("openssl/sha.h")
   $objs << "sha1ossl.#{$OBJEXT}"
+  $objs << "sha1.#{$OBJEXT}"
 else
   $objs << "sha1.#{$OBJEXT}"
 end
Index: ext/digest/sha2/extconf.rb
===================================================================
--- ext/digest/sha2/extconf.rb	(revision 27218)
+++ ext/digest/sha2/extconf.rb	(working copy)
@@ -14,6 +14,7 @@
     have_library("crypto") &&
     %w[SHA256 SHA512].all? {|d| have_func("#{d}_Transform", "openssl/sha.h")}
   $objs << "sha2ossl.#{$OBJEXT}"
+  $objs << "sha2.#{$OBJEXT}"
   $defs << "-DSHA2_USE_OPENSSL"
 else
   have_type("u_int8_t")