-libc.so.4 An a.out shared C library, version 4.x.x.
-info-browser Something that can browser GNU Info files
-kernel-source Kernel source code
-kernel-headers Kernel header files (<linux/*.h>, <asm/*.h>)
-kernel-image Kernel image (vmlinuz, System.map, modules)
-httpd Any HTTP server
-postscript-viewer Anything that can display Postscript files
-postscript-preview Any preprocessor that creates Postscript output
-www-browser Something that can browse html files
-awk Anything providing suitable /usr/bin/{awk,nawk}
-c-shell Anything providing a suitable /usr/bin/csh
-pdf-viewer Anything that can display PDF files
-pdf-preview Any preprocessor that creates PDF output
-wordlist Anything that provides /usr/dict/words
+[Those marked with a (*) are handled using the alternatives mechanism;
+others may do so as well.]
+awk Anything providing suitable /usr/bin/{awk,nawk} (*)
+c-compiler Anything providing a C compiler
+c-shell Anything providing a suitable /bin/csh (*)