Merge pull request #1003 from tk-wfischer/add-libssl-dev-requirement

add libssl-dev to requirements for Ubuntu/Debian
diff --git a/README.md b/README.md
index ea8a65e..f92d572 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@
         sudo apt-get install cscope ctags libz-dev libexpat-dev \
           python language-pack-en texinfo \
           build-essential g++ git bison flex unzip \
-          libxml-simple-perl libxml-sax-perl libxml2-dev libxml2-utils xsltproc \
+          libssl-dev libxml-simple-perl libxml-sax-perl libxml2-dev libxml2-utils xsltproc \
           wget bc
 
 ### Dependencies for *64-bit* Fedora systems