--- a/configure.ac	2021-04-14 12:03:20.819257209 -0700
+++ b/configure.ac	2021-04-14 12:27:51.050220736 -0700
@@ -1715,9 +1715,13 @@
     fi
   fi
 
-  dnl finally, set flags to use SSL
-  CPPFLAGS="$CPPFLAGS $SSL_CPPFLAGS"
-  LDFLAGS="$LDFLAGS $SSL_LDFLAGS"
+  dnl Finally, set flags to use SSL.
+  dnl If another version of OpenSSL library is present under the 'standard'
+  dnl system paths, it's necessary to pick up the header and binary files
+  dnl of the custom OpenSSL library, so put OpenSSL's custom paths first
+  dnl for both the preprocessor and the linker.
+  CPPFLAGS="$SSL_CPPFLAGS $CPPFLAGS"
+  LDFLAGS="$SSL_LDFLAGS $LDFLAGS"
 
   AC_CHECK_LIB(crypto, HMAC_Update,[
      HAVECRYPTO="yes"