diff --git a/checkin_notes b/checkin_notes
index 79b2d4968c..0266f70f43 100755
--- a/checkin_notes
+++ b/checkin_notes
@@ -9788,3 +9788,9 @@ David  1 Aug 2005
 
     lib/
         boinc_api.C
+
+
+David  1 Aug 2005
+    - add -lcrypto on Unix
+
+    configure.ac
diff --git a/configure.ac b/configure.ac
index 3c822a0373..34e8686d08 100644
--- a/configure.ac
+++ b/configure.ac
@@ -253,6 +253,8 @@ SAH_CHECK_LIB([socket], [bind],
     [BOINC_EXTRA_LIBS="${BOINC_EXTRA_LIBS} ${sah_lib_last}"])
 SAH_CHECK_LIB([z], [gzopen], 
     [BOINC_EXTRA_LIBS="${BOINC_EXTRA_LIBS} ${sah_lib_last}"])
+SAH_CHECK_LIB([crypto], [RSA_new], 
+    [BOINC_EXTRA_LIBS="${BOINC_EXTRA_LIBS} ${sah_lib_last}"])
 LIBS=${SAVELIBS_AAF}
 
 dnl check for pthread