link with it, you need the headers---and distros don't provide them with
the libraries. You need the additional "development" package, too.
+If you have installed it yourself in a non-system location, you may also
+need to specify --site-includes, --site-libraries, or --site-prefixes.
+Note that many packages, especially X11, expect to find includes in a
+subdirectory. Eg, XEmacs #includes <X11/xpm.h>, not <xpm.h>. See INSTALL.
+
*** Don't use -O2 with gcc 2.8.1 and egcs 1.0 under SPARC architectures
without also using `-fno-schedule-insns'.