INSTALL: note requirement to run ldconfig

Author: rrthomas

HACKING.org

@@ -17,6 +17,9 @@ gettext), Perl, Flex, Python, Cython, tar and wget.
   make install
 #+END_SRC
 
+On some systems you'll need to run ~ldconfig~ to make the shared libraries
+available after installation.
+
 * Making a release
 
 To make a release, you'll need [[https://github.com/rrthomas/woger][woger]] and [[https://github.com/aktau/github-release][github-release]], suitably